Appeal by defendant from a judgment of the Supreme Court, Kings County (Ryan, J.), rendered July 7, 1980, convicting him of robbery in the first degree, upon a jury verdict, and imposing sentence. ¶ Judgment affirmed. ¶ Defendant's knowing participation as a "wheelman" in a brutal robbery of a young man for his bicycle was sufficient to sustain his conviction as an accomplice (see People v Jackson, 44 N.Y.2d 935, revg 55 A.D.2d 961 and 62 A.D.2d 1186; People v Keitt, 42 N.Y.2d 926). Any claimed errors in the court's charge were not objected to at trial, and thus are not preserved for our review (CPL 470.05, subd 2). We decline to exercise our discretion in this regard. We have considered defendant's remaining contentions, and find them to be without merit. Lazer, J.P., Niehoff, Boyers and Lawrence, JJ., concur.