Subject: Re: BMX Geometry? Posted by: richie on March 02, 2005 at 17:28:29: In Reply to: BMX Geometry? posted by Erik on October 08, 2004 at 18:06:32:

Message: >I know that this website is geared towards road and MTB but I would like some detailed information on BMX geometry and how certain things affect the performance of the bike, ie shorter rear end makes it easier to manual. here it is, i have designed many a race bicycle for my friends geared to the way they wanted the bicycle to handle. a longer frame will be more likely to be a race frame( more stability in the air) and yes a shorter rear stay will enable it to manual with more ease. but go to short and it is too easy to yank up and also the bars come up to steep and making it harder to pull a bigger bunnyhop. steeper head tubes make for a faster steering bicycle as on flatland bicycles, and more slacker head tubes slow up the steering as on jumping bicycles. all and all there are too many varials to throw into the mix, as far as bmx goes the companies do not do a good enough job on informing anyone on their geometry. fork rake, b.b. drop, headtube angles and overall length from axle to axle are rarely never described. the only way to know if you are getting a frame to do what you want it to do is to testride them first. if you have any more questions or want to discuss frame geometry in theory just ask what you want to know in specifics and we can go over the ways that the frame geometry will change....