WIEAND, Judge:
In this action to recover for personal injuries sustained in a one vehicle accident allegedly caused by the defective front end assembly of a motorcycle, the trial court excluded evidence of a post-accident admission made by the plaintiff-cyclist that the accident had not been caused by a defective motorcycle but by his loss of control while travelling at 100 miles per hour. A jury returned a verdict in favor of the cyclist and against the manufacturer for $1,750,000.00, on which judgment was entered following denial of post-trial motions. On appeal, we reverse and remand for a new trial.
On October 30, 1976, James Bascelli and Dana Tegler were driving their chopper-style motorcycles on Route 291, a four lane divided highway in Delaware County, when [258]*258Bascelli lost control of his vehicle. His motorcycle veered to the left, jumped the medial strip, crossed two lanes for oncoming traffic, and crashed into the guardrail. Bascelli testified that prior to losing control of his motorcycle he had been travelling at a speed of 35-40 miles per hour. He said, and his evidence tended to show, that the handlebar assembly had loosened and that this was what had caused his loss of control. As a result of the accident Bascelli sustained serious injuries, including the loss of most of his right arm and multiple fractures of his left forearm.
The front end assembly had been manufactured by Randy, Inc., the appellant. It consisted of a handlebar, two risers and two cap screws. The assembly was sold to Bascelli with a container of Locktite, a screw-locking compound, in October, 1972, by East Coast Cycle Supply.1 It was thereafter assembled and installed by Bascelli on his Harley-Davidson motorcycle. The risers were attached to two prongs of a fork extending upwards from the front wheel by cap screws or bolts. Bascelli’s evidence tended to show that at the time of the accident the left cap screw measured only one inch in length, this being one-half inch shorter than the right cap screw. He contended that the left screw was defective because it extended only two or three threads beyond the end of the fork into which it was intended to fit.2 It was also alleged that the assembly contained a design defect because it. did not include a locking device to prevent a loosening of the screws. Evidence was produced which tended to show that a disengagement of the screw from the fork had impaired Bascelli’s ability to steer the motorcycle.
During pre-trial depositions, Anthony Pierantozzi, the retailer of the .front end assembly, described a conversation which he and Bascelli had had several months after the [259]*259accident. In that conversation, according to Pierantozzi, Bascelli said that “nothing [had] really happened to the front end ...” and that the front end had begun to wobble and the bike had gone down while he was travelling at approximately 100 miles per hour. At trial, counsel for the manufacturer attempted to elicit Bascelli’s admission from Pierantozzi to show that the accident had been caused by excessive speed and not because of a defective front end assembly. The trial court sustained an objection thereto because the evidence tended to show contributory negligence which, the court said, was irrelevant in a products liability case.
Before a manufacturer can be found strictly liable for damages caused by his product, it must be shown that his product was defective and that the defect was a substantial factor in causing plaintiff’s injuries. Sherk v. Daisy-Heddon, 498 Pa. 594, 598, 450 A.2d 615, 617 (1982) (plurality opinion); Berkebile v. Brantly Helicopter Corp., 462 Pa. 83, 93-94, 337 A.2d 893, 898 (1975) (plurality opinion); Swartz v. General Electric Co., 327 Pa.Super. 58, 66, 474 A.2d 1172, 1176 (1984). “The progress of the law in extending liability without fault to product suppliers [has not been] in disregard of fundamentals pertaining to the tort law of causation.” Oehler v. Davis, 223 Pa.Super. 333, 334, 298 A.2d 895, 895 (1972).
In the instant case, the cause for Bascelli’s losing control of his motorcycle was an issue of fact for the jury. An admission by Bascelli that he had lost control of the cycle while going 100 miles per hour was significantly relevant and extremely important evidence. It was admissible to show the cause of the accident;3 to exclude it for that purpose was error.
Because the evidence was relevant to show the cause of the accident it could not properly be excluded, as the trial [260]*260court seemed to think, because other evidence tended to show that the loosening of the front end assembly had caused the operator to lose control. This, as we have already observed, was an issue for the jury. Similarly, the evidence could not be excluded merely because it "also tended to show “contributory negligence” on the part of the operator. It was admissible for the purpose of showing causation. See: Greiner v. Volkswagenwerk Aktiengeselleschaft, 540 F.2d 85 (3d Cir.1976) (evidence of drinking admissible to show causation); Englehart v. Jeep Corp., 122 Ariz. 256, 260, 594 P.2d 510, 514 (1979) (evidence of plaintiffs intoxication, though not admissible to show contributory negligence, may be admitted on issue of proximate cause); Honda Motor Co. v. Marcus, 440 So.2d 373 (Fla.Dist.Ct.App.1983) (failure to wear seat belt may be shown if it bore causal relation to injuries); Scott v. Bolan Ford, Inc., 420 So.2d 1345 (La.Ct.App.1982) (intoxication admissible if relevant to causation); Bendorf v. Volkswagenwerk Aktiengeselischaft, 90 N.M. 414, 416, 564 P.2d 619, 621 (N.M.Ct.App.1977) (negligence of plaintiff relevant if his wrongful driving was proximate cause of accident); Caldwell v. Yamaha Motor Co., 648 P.2d 519, 527 (Wyo. 1982) (negligence of motorcyclist admissible if offered to prove causation or to impeach his testimony).
Appellee, hard pressed to justify the exclusion of this relevant evidence, argues that appellant’s offer of proof was inadequate. This argument is lacking in merit. The record shows that as soon as appellant’s counsel had asked Pierantozzi about a meeting with Bascelli, the latter’s counsel asked for a side-bar conference, where he requested an offer of proof. When appellant’s counsel referred to the testimony which Pierantozzi had given during pre-trial depositions, he was interrupted before he had completed the offer of proof which Bascelli’s counsel had requested. No sooner had appellant’s counsel mentioned Bascelli’s admission that he had been going a hundred miles per hour than Bascelli’s counsel interjected, “So what?”. Appellant’s counsel answered this interjected question by saying that [261]*261he wished to introduce Bascelli’s admission of speed to show the cause of the accident.
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WIEAND, Judge:
In this action to recover for personal injuries sustained in a one vehicle accident allegedly caused by the defective front end assembly of a motorcycle, the trial court excluded evidence of a post-accident admission made by the plaintiff-cyclist that the accident had not been caused by a defective motorcycle but by his loss of control while travelling at 100 miles per hour. A jury returned a verdict in favor of the cyclist and against the manufacturer for $1,750,000.00, on which judgment was entered following denial of post-trial motions. On appeal, we reverse and remand for a new trial.
On October 30, 1976, James Bascelli and Dana Tegler were driving their chopper-style motorcycles on Route 291, a four lane divided highway in Delaware County, when [258]*258Bascelli lost control of his vehicle. His motorcycle veered to the left, jumped the medial strip, crossed two lanes for oncoming traffic, and crashed into the guardrail. Bascelli testified that prior to losing control of his motorcycle he had been travelling at a speed of 35-40 miles per hour. He said, and his evidence tended to show, that the handlebar assembly had loosened and that this was what had caused his loss of control. As a result of the accident Bascelli sustained serious injuries, including the loss of most of his right arm and multiple fractures of his left forearm.
The front end assembly had been manufactured by Randy, Inc., the appellant. It consisted of a handlebar, two risers and two cap screws. The assembly was sold to Bascelli with a container of Locktite, a screw-locking compound, in October, 1972, by East Coast Cycle Supply.1 It was thereafter assembled and installed by Bascelli on his Harley-Davidson motorcycle. The risers were attached to two prongs of a fork extending upwards from the front wheel by cap screws or bolts. Bascelli’s evidence tended to show that at the time of the accident the left cap screw measured only one inch in length, this being one-half inch shorter than the right cap screw. He contended that the left screw was defective because it extended only two or three threads beyond the end of the fork into which it was intended to fit.2 It was also alleged that the assembly contained a design defect because it. did not include a locking device to prevent a loosening of the screws. Evidence was produced which tended to show that a disengagement of the screw from the fork had impaired Bascelli’s ability to steer the motorcycle.
During pre-trial depositions, Anthony Pierantozzi, the retailer of the .front end assembly, described a conversation which he and Bascelli had had several months after the [259]*259accident. In that conversation, according to Pierantozzi, Bascelli said that “nothing [had] really happened to the front end ...” and that the front end had begun to wobble and the bike had gone down while he was travelling at approximately 100 miles per hour. At trial, counsel for the manufacturer attempted to elicit Bascelli’s admission from Pierantozzi to show that the accident had been caused by excessive speed and not because of a defective front end assembly. The trial court sustained an objection thereto because the evidence tended to show contributory negligence which, the court said, was irrelevant in a products liability case.
Before a manufacturer can be found strictly liable for damages caused by his product, it must be shown that his product was defective and that the defect was a substantial factor in causing plaintiff’s injuries. Sherk v. Daisy-Heddon, 498 Pa. 594, 598, 450 A.2d 615, 617 (1982) (plurality opinion); Berkebile v. Brantly Helicopter Corp., 462 Pa. 83, 93-94, 337 A.2d 893, 898 (1975) (plurality opinion); Swartz v. General Electric Co., 327 Pa.Super. 58, 66, 474 A.2d 1172, 1176 (1984). “The progress of the law in extending liability without fault to product suppliers [has not been] in disregard of fundamentals pertaining to the tort law of causation.” Oehler v. Davis, 223 Pa.Super. 333, 334, 298 A.2d 895, 895 (1972).
In the instant case, the cause for Bascelli’s losing control of his motorcycle was an issue of fact for the jury. An admission by Bascelli that he had lost control of the cycle while going 100 miles per hour was significantly relevant and extremely important evidence. It was admissible to show the cause of the accident;3 to exclude it for that purpose was error.
Because the evidence was relevant to show the cause of the accident it could not properly be excluded, as the trial [260]*260court seemed to think, because other evidence tended to show that the loosening of the front end assembly had caused the operator to lose control. This, as we have already observed, was an issue for the jury. Similarly, the evidence could not be excluded merely because it "also tended to show “contributory negligence” on the part of the operator. It was admissible for the purpose of showing causation. See: Greiner v. Volkswagenwerk Aktiengeselleschaft, 540 F.2d 85 (3d Cir.1976) (evidence of drinking admissible to show causation); Englehart v. Jeep Corp., 122 Ariz. 256, 260, 594 P.2d 510, 514 (1979) (evidence of plaintiffs intoxication, though not admissible to show contributory negligence, may be admitted on issue of proximate cause); Honda Motor Co. v. Marcus, 440 So.2d 373 (Fla.Dist.Ct.App.1983) (failure to wear seat belt may be shown if it bore causal relation to injuries); Scott v. Bolan Ford, Inc., 420 So.2d 1345 (La.Ct.App.1982) (intoxication admissible if relevant to causation); Bendorf v. Volkswagenwerk Aktiengeselischaft, 90 N.M. 414, 416, 564 P.2d 619, 621 (N.M.Ct.App.1977) (negligence of plaintiff relevant if his wrongful driving was proximate cause of accident); Caldwell v. Yamaha Motor Co., 648 P.2d 519, 527 (Wyo. 1982) (negligence of motorcyclist admissible if offered to prove causation or to impeach his testimony).
Appellee, hard pressed to justify the exclusion of this relevant evidence, argues that appellant’s offer of proof was inadequate. This argument is lacking in merit. The record shows that as soon as appellant’s counsel had asked Pierantozzi about a meeting with Bascelli, the latter’s counsel asked for a side-bar conference, where he requested an offer of proof. When appellant’s counsel referred to the testimony which Pierantozzi had given during pre-trial depositions, he was interrupted before he had completed the offer of proof which Bascelli’s counsel had requested. No sooner had appellant’s counsel mentioned Bascelli’s admission that he had been going a hundred miles per hour than Bascelli’s counsel interjected, “So what?”. Appellant’s counsel answered this interjected question by saying that [261]*261he wished to introduce Bascelli’s admission of speed to show the cause of the accident. Bascelli’s counsel argued that evidence of speed would be error because it would tend to show contributory negligence, which was not a defense to a claim resting on strict liability. The trial court agreed and sustained an objection to any such evidence despite a protest by appellant that evidence pertaining to the cause of the accident was being concealed from the jury.4 The court’s reason for sustaining the objection, as confirmed by subsequent opinion, was specifically its belief that the evidence was inadmissible because it tended to show that Bascelli had been guilty of contributory negligence.
The offer of proof, however, had contained a clear statement that Bascelli’s admission of excessive speed was being offered to show the cause of the accident. Such an offer was certainly sufficient “to state the purpose [of the evidence] in a manner that the court [could] perceive its relevancy.” Societa Palmolese Di Protezione E Beneficenza v. Maiale, 143 Pa.Super. 403, 407, 17 A.2d 925, 927 (1941). Accord: Martin v. Johns-Manville Corp., 322 Pa. Super. 348, 356, 469 A.2d 655, 658 (1983), appeal docketed, 33 W.D. Appeal Dkt. 1984 (April 2, 1984). Thus, even though appellant’s counsel was interrupted before completing his statement of the offer so as to include the entirety of Bascelli’s admission, the trial court had enough informa[262]*262tion to know that Bascelli had made an admission of a speed of 100 miles per hour and that this evidence was being offered to show the cause of the accident. When the trial court refused to allow the evidence for this purpose, it committed error. The evidence of excessive speed was not rendered inadmissible merely because it also tended to show contributory negligence on the part of the plaintiff.5
Appellant has asserted additional trial errors which also have merit. The evidence at trial showed that when the front end assembly had been sold to Bascelli, it had come with a container of Locktite. Appellant offered to show that the properties of Locktite were such that it was a recommended screw-locking device. The trial court refused to allow the evidence on grounds that it was irrelevant to the condition of the assembly when it left the manufacturer. This was error.
One who sells a product in a defective condition unreasonably dangerous is subject to liability for physical harm caused thereby if “it is expected to and. does reach the user or consumer without substantial change in the condition in which it is sold.” Webb v. Zern, 422 Pa. 424, 427, 220 A.2d 853, 854 (1966), quoting Restatement (Second) of Torts § 402A(l)(b) (1965). If a product is altered to make it safer after leaving the manufacturer but before reaching the consumer, the change is clearly relevant. In the instant case, the manufacturer was charged, inter alia, with defectively designing a product which lacked a locking device that would prevent a screw from being loosened by the jolting and bouncing to which a motorcycle would foresee-ably be subjected. It was relevant, in view of this claim, to show that when the front end assembly had been sold [263]*263unassembled to the consumer, it was sold with a container of Locktite which, if properly applied, was calculated to lock the screw in place. The purpose for and the qualities of Locktite, therefore, were relevant facts for the jury to know in order to determine whether the front end assembly had been sold to the consumer in a defective condition. The evidence regarding Locktite was not rendered inadmissible merely because it had been supplied by the retailer rather than by the manufacturer. Contrary to the trial court’s belief, the relevant time for determining whether the front end assembly was defective was the time when it reached the consumer, not when it left the manufacturer. See: Lenkiewcz v. Lange, 242 Pa.Super. 87, 91, 363 A.2d 1172, 1175 (1976); Josephs v. Harris Corp., 677 F.2d 985, 987-988 (3d Cir.1982) (applying Pennsylvania law).
It was also error to remove from the jury the issue of Bascelli’s voluntary assumption of the risk. If either screw had been of inadequate length, this fact should have been readily observable by the person who installed the front end assembly and who inserted and tightened the screws. In this case, the front end assembly had been installed by Bascelli himself. He had previously worked in his father’s machine shop and admittedly had been aware that bolts came in different sizes and were susceptible to disengagement because of vibration. It was arguable, therefore, that Bascelli had knowingly made use of an inadequate screw to install the front end assembly on his motorcycle. There was also evidence from which, if believed, a jury could infer that he had used Locktite only on one screw.
In Ferraro v. Ford Motor Co., 423 Pa. 324, 223 A.2d 746 (1966) the Supreme Court held unequivocally that if a buyer knows of a defect and voluntarily and unreasonably proceeds to use the product or encounter a known danger, this will constitute a defense to and preclude recovery in an action based on strict liability under Section 402A of the Restatement (Second) of Torts. Id., 423 Pa. at 327, 223 A.2d at 748. Accord: Berkebile v. Brantly Helicopter [264]*264Corp., supra 462 Pa. at 100, 337 A.2d at 901. Although voluntary assumption of the risk must rest upon a subjective awareness of the defect, this awareness can be proved by circumstantial evidence sufficient to permit an inference that the user was aware thereof and understood the risk. Weaver v. Clabaugh, 255 Pa.Super. 532, 536, 388 A.2d 1094, 1096 (1978); Restatement (Second) of Torts § 496D, comment d (1965). “Whether the plaintiff knows of the existence of the risk, or whether he understands and appreciates its magnitude and its unreasonable character, is a question of fact, usually to be determined by the jury under proper instructions from the court. The court may itself determine the issue only where reasonable men could not differ as to the conclusion.” Restatement (Second) of Torts § 496D, comment e (emphasis added).
This was not a case in which the issue of voluntary assumption of the risk could properly be taken from the jury and decided by the court. The issue should have been submitted to the jury upon proper instructions. There was evidence from which a jury could have inferred that Bascelli had voluntarily assumed a known risk or danger.
Because the case must be retried before another jury, we do not decide whether the amount of the verdict was excessive. Granting or refusing a new trial in the face of such an argument, it may nevertheless be observed, is within the discretion of the trial court whose exercise thereof will not be reversed in the absence of a clear abuse of that discretion. Dougherty v. Sadsbury Township, 299 Pa.Super. 357, 360, 445 A.2d 793, 795 (1982).
Reversed and remanded for a new trial. Jurisdiction is not retained.
OLSZEWSKI, J., files a dissenting opinion.