Walleee Posted January 23, 2006 Report Share Posted January 23, 2006 Ok so i've established that +30mm etc indicates a bottom bracket rise, but where is the datum for the measurement +30? Centre of the rear axle? Quote Link to comment Share on other sites More sharing options...
SQuiT-man Posted January 23, 2006 Report Share Posted January 23, 2006 Ok so i've established that +30mm etc indicates a bottom bracket rise, but where is the datum for the measurement +30? Centre of the rear axle?I think it is if you were to draw a line between the two axles, the rise vertically above that line to the centre of the BB. Quote Link to comment Share on other sites More sharing options...
Walleee Posted January 23, 2006 Author Report Share Posted January 23, 2006 Hmm, so the figures all these companies are coming out with are useless without a fork length at least for referance.The thing is, my bike seems to have a bottom bracket rise by what your saying, maybe it does, but I thought this was a fairly recent development...... Quote Link to comment Share on other sites More sharing options...
dave85 Posted January 23, 2006 Report Share Posted January 23, 2006 Vinco's have been around ages with really high BB's, the DBR tibo was +something, i know the planet x tibo was +20, the old megamo radicals were +30, its not such a new idea really. Quote Link to comment Share on other sites More sharing options...
endofreak Posted January 24, 2006 Report Share Posted January 24, 2006 The thing is, my bike seems to have a bottom bracket rise by what your saying, maybe it does, but I thought this was a fairly recent development......Don't you ride a mod Jake? As far as I am aware, all mods have BB rise. It's just a new development in the world of 26 inch wheels. Well, not exactly new, but it's only recently that bike companies have went a bit mental with the designs. Quote Link to comment Share on other sites More sharing options...
Walleee Posted January 24, 2006 Author Report Share Posted January 24, 2006 Don't you ride a mod Jake? As far as I am aware, all mods have BB rise. It's just a new development in the world of 26 inch wheels. Well, not exactly new, but it's only recently that bike companies have went a bit mental with the designs.yep, well..... I try.... Interesting to know about the megamo and such, wouldn't have thought such an old school bike had that sort of geometry, having said that, i've only started thinking about geometry and stuff. Quote Link to comment Share on other sites More sharing options...
mat hudson Posted January 24, 2006 Report Share Posted January 24, 2006 if it didnt, the cranks would practically be touching the floor . Quote Link to comment Share on other sites More sharing options...
Walleee Posted January 24, 2006 Author Report Share Posted January 24, 2006 if it didnt, the cranks would practically be touching the floor .Sorry, if what didn't? A few differant points have been brought up here. Quote Link to comment Share on other sites More sharing options...
medwaytrials Posted January 24, 2006 Report Share Posted January 24, 2006 The higher the bottom bracket is, the more virtical the chainstay is when your on the back wheel so it makes it easier on the back wheel. Quote Link to comment Share on other sites More sharing options...
dave85 Posted January 24, 2006 Report Share Posted January 24, 2006 A mod pretty much has to have bb rise, it would be a bit of a dog to ride with a level bb, the ground clearance would be shocking too. Quote Link to comment Share on other sites More sharing options...
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