Greenberg, J.
Officer Jerome Riley of the Boston police, while on routine patrol in the Fields Corner (Dorchester) neighborhood of Boston at 10 p.m., April 22, 1998, got a radio call directing him to the area of Harbell Terrace and Leonard Street. Rowdy youths were drinking and causing a ruckus. This was not the first time he had visited that area on such a complaint. As he drew close to the intersection of Leonard and Duncan Streets, he observed a group of five or six “kids” on the comer, most of whom he recognized “by face.” Standing tall at their feet were five or six bottles, some still with beer inside. Bringing his police car alongside the group, Riley told them to leave. One of those who left on his admonition was the defendant, Moscat. Fie was on a bicycle, and Riley saw him struggling to turn it. As he watched the defendant maneuver it around and ride off with some difficulty up Duncan Street, Ri[623]*623ley noticed that the defendant had only one hand on the handlebars. He was bent over to the left, holding his left hand close to his body as if to conceal something. Riley followed and asked him to stop. “What are you holding] — what are you concealing down there?” he asked. Suspecting a bottle of beer, Riley began to reach his hand toward the left side of the defendant’s shirt. To his surprise, a .32 caliber revolver clanked to the ground.
As a result of this encounter, the defendant was charged with unlawful possession of a firearm (G. L. c. 269, § 10[a]) and possession of ammunition without the requisite firearm identification card (G. L. c. 269, § 10[h]; G. L. c. 140, § 129C). He moved in the District Court to suppress the weapon discovered during the stop. His motion failed. After trial and conviction on both offenses, the defendant appeals, bringing up for review the refusal to suppress.
To return to the details of the stop and subsequent events, we draw the essential facts from the judge’s findings, with amplification from the record. Riley recognized most of the young people and knew some by name but not the defendant. Riley did not intend to arrest any of them. He merely told them to leave the area and warned them of the consequences should he be compelled to return to the comer that evening. While the others simply grumbled a little and then dispersed empty-handed, the judge found that Riley “reasonably believed that the defendant was secreting alcohol under his shirt.”
The judge ruled that Riley was justified in reaching out to pat frisk the defendant under the holding of Terry v. Ohio, 392 U.S. 1 (1968), because of the “accumulated factors and a reasonable concern for his personal safety.” Further, the judge thought that Riley’s limited intrusion was proportional to the degree of suspicion that prompted the stop. She concluded that, without contact, the pat frisk had not actually been conducted before probable cause was established by the appearance of the gun.
“[T]he ultimate legal conclusion to be drawn from the fact[s] developed at the hearing [on the motion to suppress] is a matter for our review, particularly where the conclusion is of constitutional dimension.” Commonwealth v. Accaputo, 380 Mass. 435, 448 n.18 (1980). We do not reach the question whether there was a valid basis for a Terry stop at the outset because, on quite a different analysis from that employed by the judge, we hold that the search was incident to a lawful arrest.
[624]*624We need to put aside propositions that are not involved in order to reach the particular part that is an issue. For the present analysis we need not dispute that the police, before making an arrest, may approach and question a person for investigative purposes without implicating constitutional interests as long as the individual’s ability to avoid the encounter remains viable. See Michigan v. Chesternut, 486 U.S. 567, 573-574 (1988). For this reason, we need not quarrel with Riley’s approach to the drinkers on the comer. Similarly, there is no dispute that the police may arrest minors in possession of alcohol. See G. L. c. 138, § 34C. Finally, we recognize that the police may handle the situation without making an arrest if they so choose. See Cambridge v. Phillips, 415 Mass. 126, 129 n.3 (1993), quoting from Hameetman v. Chicago, 776 F.2d 636, 641 (7th Cir. 1985). What the police may not do is hamper an individual’s freedom of movement to the extent that an investigative inquiry will be treated as an arrest. See Florida v. Royer, 460 U.S. 491, 502-50.3 (1983). As such, a stop may not be so intrusive in duration or manner as to violate constitutional provisions unless done on probable cause. See id. at 501.
“[P]robable cause exists where, at the moment of arrest, the facts and circumstances within the knowledge of the police are enough to warrant a prudent person in believing that the individual arrested has committed or was committing an offense.” Commonwealth v. Santaliz, 413 Mass. 238, 241 (1992), quoting from Commonwealth v. Storey, 378 Mass. 312, 321 (1979), cert. denied, 446 U.S. 955 (1980). Reasonable inferences may be considered as well. See Commonwealth v. Kennedy, 426 Mass. 703, 707 (1998). “ ‘Whether an inference is warranted or is impermissibly remote must be determined, not by hard and fast rules of law, but by experience and common sense.’ Commonwealth v. Arias, 29 Mass. App. Ct. 613, 618 (1990), S.C., 410 Mass. 1005 (1991), quoting Commonwealth v. Drew, 4 Mass. App. Ct. 30, 32 (1976).” Id. at 707-708. The sum total must be “more than mere suspicion but something less than evidence sufficient to warrant a conviction.” Commonwealth v. Badgett, 38 Mass. App. Ct. 624, 625 (1995), quoting Commonwealth v. Roman, 414 Mass. 642, 643 (1993).
Turning to the instant case, we are satisfied that when Officer Riley stopped the defendant on his bicycle he had probable [625]*625cause to arrest him.1 As in Commonwealth v. Kennedy, supra at 708, were we “to scrutinize in isolation” each fact then known to the officer, we might conclude that Riley lacked probable cause. However, all of the circumstances taken together objectively warranted a reasonable belief that the defendant was currently committing a crime: possessing alcohol while underage.
First, the officer had a report that a group of rowdy teenagers were drinking alcohol and annoying the neighbors. Second, the officer saw the defendant, who looked — and was — underage, standing with friends in front of a collection of half-full beer bottles. Third, after the rest of the group took off and the defendant rode away up Duncan Street, his particular behavior on the bicycle — hunched over the seat, pressing his left arm to his side, and steering with one hand despite the obvious difficulty it gave him — drew Riley’s attention. The defendant appeared to be clutching something underneath his shirt. The officer’s inference that the “something” was a bottle of beer was warranted, and based on common sense.
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Greenberg, J.
Officer Jerome Riley of the Boston police, while on routine patrol in the Fields Corner (Dorchester) neighborhood of Boston at 10 p.m., April 22, 1998, got a radio call directing him to the area of Harbell Terrace and Leonard Street. Rowdy youths were drinking and causing a ruckus. This was not the first time he had visited that area on such a complaint. As he drew close to the intersection of Leonard and Duncan Streets, he observed a group of five or six “kids” on the comer, most of whom he recognized “by face.” Standing tall at their feet were five or six bottles, some still with beer inside. Bringing his police car alongside the group, Riley told them to leave. One of those who left on his admonition was the defendant, Moscat. Fie was on a bicycle, and Riley saw him struggling to turn it. As he watched the defendant maneuver it around and ride off with some difficulty up Duncan Street, Ri[623]*623ley noticed that the defendant had only one hand on the handlebars. He was bent over to the left, holding his left hand close to his body as if to conceal something. Riley followed and asked him to stop. “What are you holding] — what are you concealing down there?” he asked. Suspecting a bottle of beer, Riley began to reach his hand toward the left side of the defendant’s shirt. To his surprise, a .32 caliber revolver clanked to the ground.
As a result of this encounter, the defendant was charged with unlawful possession of a firearm (G. L. c. 269, § 10[a]) and possession of ammunition without the requisite firearm identification card (G. L. c. 269, § 10[h]; G. L. c. 140, § 129C). He moved in the District Court to suppress the weapon discovered during the stop. His motion failed. After trial and conviction on both offenses, the defendant appeals, bringing up for review the refusal to suppress.
To return to the details of the stop and subsequent events, we draw the essential facts from the judge’s findings, with amplification from the record. Riley recognized most of the young people and knew some by name but not the defendant. Riley did not intend to arrest any of them. He merely told them to leave the area and warned them of the consequences should he be compelled to return to the comer that evening. While the others simply grumbled a little and then dispersed empty-handed, the judge found that Riley “reasonably believed that the defendant was secreting alcohol under his shirt.”
The judge ruled that Riley was justified in reaching out to pat frisk the defendant under the holding of Terry v. Ohio, 392 U.S. 1 (1968), because of the “accumulated factors and a reasonable concern for his personal safety.” Further, the judge thought that Riley’s limited intrusion was proportional to the degree of suspicion that prompted the stop. She concluded that, without contact, the pat frisk had not actually been conducted before probable cause was established by the appearance of the gun.
“[T]he ultimate legal conclusion to be drawn from the fact[s] developed at the hearing [on the motion to suppress] is a matter for our review, particularly where the conclusion is of constitutional dimension.” Commonwealth v. Accaputo, 380 Mass. 435, 448 n.18 (1980). We do not reach the question whether there was a valid basis for a Terry stop at the outset because, on quite a different analysis from that employed by the judge, we hold that the search was incident to a lawful arrest.
[624]*624We need to put aside propositions that are not involved in order to reach the particular part that is an issue. For the present analysis we need not dispute that the police, before making an arrest, may approach and question a person for investigative purposes without implicating constitutional interests as long as the individual’s ability to avoid the encounter remains viable. See Michigan v. Chesternut, 486 U.S. 567, 573-574 (1988). For this reason, we need not quarrel with Riley’s approach to the drinkers on the comer. Similarly, there is no dispute that the police may arrest minors in possession of alcohol. See G. L. c. 138, § 34C. Finally, we recognize that the police may handle the situation without making an arrest if they so choose. See Cambridge v. Phillips, 415 Mass. 126, 129 n.3 (1993), quoting from Hameetman v. Chicago, 776 F.2d 636, 641 (7th Cir. 1985). What the police may not do is hamper an individual’s freedom of movement to the extent that an investigative inquiry will be treated as an arrest. See Florida v. Royer, 460 U.S. 491, 502-50.3 (1983). As such, a stop may not be so intrusive in duration or manner as to violate constitutional provisions unless done on probable cause. See id. at 501.
“[P]robable cause exists where, at the moment of arrest, the facts and circumstances within the knowledge of the police are enough to warrant a prudent person in believing that the individual arrested has committed or was committing an offense.” Commonwealth v. Santaliz, 413 Mass. 238, 241 (1992), quoting from Commonwealth v. Storey, 378 Mass. 312, 321 (1979), cert. denied, 446 U.S. 955 (1980). Reasonable inferences may be considered as well. See Commonwealth v. Kennedy, 426 Mass. 703, 707 (1998). “ ‘Whether an inference is warranted or is impermissibly remote must be determined, not by hard and fast rules of law, but by experience and common sense.’ Commonwealth v. Arias, 29 Mass. App. Ct. 613, 618 (1990), S.C., 410 Mass. 1005 (1991), quoting Commonwealth v. Drew, 4 Mass. App. Ct. 30, 32 (1976).” Id. at 707-708. The sum total must be “more than mere suspicion but something less than evidence sufficient to warrant a conviction.” Commonwealth v. Badgett, 38 Mass. App. Ct. 624, 625 (1995), quoting Commonwealth v. Roman, 414 Mass. 642, 643 (1993).
Turning to the instant case, we are satisfied that when Officer Riley stopped the defendant on his bicycle he had probable [625]*625cause to arrest him.1 As in Commonwealth v. Kennedy, supra at 708, were we “to scrutinize in isolation” each fact then known to the officer, we might conclude that Riley lacked probable cause. However, all of the circumstances taken together objectively warranted a reasonable belief that the defendant was currently committing a crime: possessing alcohol while underage.
First, the officer had a report that a group of rowdy teenagers were drinking alcohol and annoying the neighbors. Second, the officer saw the defendant, who looked — and was — underage, standing with friends in front of a collection of half-full beer bottles. Third, after the rest of the group took off and the defendant rode away up Duncan Street, his particular behavior on the bicycle — hunched over the seat, pressing his left arm to his side, and steering with one hand despite the obvious difficulty it gave him — drew Riley’s attention. The defendant appeared to be clutching something underneath his shirt. The officer’s inference that the “something” was a bottle of beer was warranted, and based on common sense. It was at this point that he left his police car and asked the defendant what he was concealing. The defendant said nothing, still holding his left arm close. Perhaps none of the aspects of the situation, standing alone, would suffice to establish probable cause for the arrest of the defendant, but taken together there was enough. See Commonwealth v. Santaliz, 413 Mass. 238, 242 (1992). Compare Commonwealth v. Laureano, 411 Mass. 708, 710 (1992) (police officer’s observation of bag of white powder in plain view in urinal within arm’s length of defendant, who was standing by but not using urinal, established probable cause).2
It appears that Riley’s search of the defendant’s person preceded his arrest. That was the circumstance in Commonwealth v. Johnson, 413 Mass. 598, 602 (1992), where the Supreme Judicial Court said that “[t]he fact that the search preceded the formal arrest is not important, ‘as long as probable cause [to arrest] existed independent of the results of the [626]*626search,’ ” quoting Commonwealth v. Brillante, 399 Mass. 152, 154-155 n.5 (1987). In this case, the purpose of the subsequent search of the defendant was to identify the object which the defendant was attempting to conceal under his shirt: suspected, of course, to be a bottle of beer. See G. L. c. 276, § 1 (authorizing searches incident to arrest for purpose of seizing evidence of that crime). Here the police had probable cause to search the defendant for alcoholic beverages, coupled with the exigent circumstance of his riding away from the intersection. “As the search [of his person] was constitutionally permissible in objective and scope, the [weapon was] admissible in evidence although [its] discovery was wholly unanticipated.” Commonwealth v. Skea, 18 Mass. App. Ct. 685, 701 (1984).
Judgment affirmed.