Bike Forums - View Single Post - Understanding BB drop on downsizing wheelsets...

08-10-19 | 05:24 PM

#5

Bill Kapaun

Really Old Senior Member

Joined: Feb 2007

Posts: 14,639

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From: Mid Willamette Valley, Orygun

Bikes: 87 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds. 2019 Giant Explore E+3

Quote:

Originally Posted by Bike Jedi

.......then I do 730-726mm = 4 mm.

I am not sure where the author got "2mm" from. How actually do I figure this out exactly?......

Your method measures to the top of the tire.
The axle will move 1/2 as much.

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