bike "up-grades"
so my brother is getting a bmx for x-mas, a pretty good one to(s & m frame etc), got it at a garage sale cheap
but the problem is, it has the bigger crank in the front, while he has mentioned that he likes the look of the smaller crank cog in the front.
now i dont know much about bmx bikes, so is this just purely cosmetics, or is there actually a difference between the sizes? and what and how much would it cost to replace these parts. im assuming i have to replace the rear cog to even out the ratio size?
and help would be appreciated
thanks