Re: Are FS 29er’s for big guys only?

#89958

OK then, after a few hours in the saddle of my smells-new Rumblefish 17.5" I’m finding it to be just fine ergonomically, and this thing is just too easy- point and shoot/slam 😃

But there is something I don’t really comprehend related to geometry/sizing in general, and this may be dumb….
After casual observation of spec sheets it seems that almost all bikes come with 175mm crank arms, except the smallest frames offered with 170mm. But intuition says that they should vary more, considering huge leg length differences between someone 5’3" and 6’6"+, and frame sizes 16 to 21+?
So why only 5mm difference between these cranksets and only shorter?? No 180, 185, nor 165 etc.
Seems to me that they would be a range proportional to frames/peoples frames :?: