#16
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The feeling is even more exaggerated on my dekerf mtb, which definitely has a sitting on top of feeling. |
#17
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If a 15mm makes a "huge difference" in a feeling of stability, then does that mean that taller riders (whose centers of gravity are much higher than shorter riders) will never feel stable on a bike? |
#18
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__________________
Cheers...Daryl Life is too important to be taken seriously |
#19
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And, yeah. A lot of bigger bikes have more BB drop and longer chainstays to help with stability. |
#20
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Read Tom Kellogg's blog on the first time he used a compact frame and then talk about level top tubes vs sloping...
There's a fair difference in fork trail between those two bikes, too. Handling might feel quicker on the one with 56mm trail and maybe more stable on the one with 59mm trail. |
#21
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It may be the opposite.. BB height only affects pedal clearance. Change the crank length and you fix it. BB drop is the center of gravity against wheel axles.
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#22
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SEat tube length effect is placebo of the highest order. |
#23
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Can you give any examples? I just checked a few Trek (Domane and Checkpoint) and Specialized (Roubaix and Tarmac). In all of them, the larger sizes had less BB drop (higher BBs). I suspect that the reason for lower BBs on smaller bikes is to decrease standover, and higher BBs on bigger bikes to maintain pedal clearance (with longer cranks). |
#24
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Seat tube lengths vary greatly between the bikes, saddle heights are within mm's of one another. Relationship of bum to BB is about the same, relationship of bum to ground is very different. |
#25
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I am not an authority but from what i know it´s the BB acting as a pivot against the wheel axles. It´s one of the reasons 29ers corner better than 26inchers. A low bb or bigger bb drop gives stability and less resistance when changing direction so cornering feels like the bike is gripping the ground better.
Last edited by colker; 09-11-2019 at 03:06 PM. |
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