Help me please with choosing geo (and to understand what it gives)

[FamilyBiker]

archive,reach around 666

andré´s,reach around 645

dont know it exactly,but should be close

as for the reach of pure street bikes(like ns):most have reaches around 630-645,so that isnt comparable really.

hta:the steeper,the more it feels to have weight shifted to the front,front wheel stuff is easier.but the bike gets unstable(kind of)on speed moves imo.

short cs are good imo,with no disadvantage,but can be preference though

bb rise:if you have the same relative handlebar height you get not much difference from that

for example my handlebars are in nearly the same position relative to the bb as on my old frame,which had +18bb,and the new has +50,and the difference is marginal(but its better on the rear wheel),and i can change stems to make it trialsy.

trials is an individualist sport,and so the preferences are pretty individual too

you´ll have to ride different bikes to figure that out,or guess and win...

or not

Edited December 3, 2013 by FamilyBiker

[Themistoklidis]

Thread bump:

Can someone explain what difference the seat tube angle makes?For example the most common BMX geometry is 75ha/71sa,would that work for street trials?(with certain adaptations to CS/TT length of course).Im thinking about getting a custom frame myself,and the the geometry i have in my mind is similar to the ones mentioned above: 74.5HA/??SA/365 chainstays/+25bb/and i would like to lengthen the headtube/seat tube(standover height?) by 1-2 cm in order to run less spacers as I'm tall.

[FamilyBiker]

on bikes where youre not really sitting the seat angle is mostly put in a way that makes the triangles rectangular to each other,makes a stronger build.

Edited December 29, 2013 by FamilyBiker

[isitafox]

And you don't want the headtube to be too long as this stops the front end from being a triangle and turns it to a square losing the overall strength of the frame.