Re: Thinking of changing crank 165m to 175mm

On Wed, 19 Feb 2025 19:28:04 -0600, AMuzi <am@yellowjersey.org> wrote:

On 2/19/2025 5:47 PM, Catrike Ryder wrote:

 
I found a lightly used set of 175mm crank arms capable of taking a 5
bolt 130mm triple.
 
The seller says they have a ISIS BB interface.  My current crankset is
Sram Hollowcore so I'll need a new Bottom Bracket. My current BB is a
Sram Truvita Team GXP English. I had no trouble changing out the worn
out OEM Sram GXP BSA 10-4, but I'm at a loss on how to select the
correct ISIS BB.
 
Any help will be appreciated.
 
--
C'est bon
Soloman

>
Check out the crank manufacturer's page on that product for
recommended spindle length.

I couldn't find anything about a cartridge BB specifically on a
Catrike.

My confusion was establishing the proper overall cartridge length from
my shell width, which is 68mm. I see 68 x 108, 68X113, 68X118. It
seems to me that the differences will only involve the chainline,
which shouldn't matter too much because my chainlines run through
idlers, but still I want to minimize chain deflection. Sheldon's
website solved the problem for me. Triples and singles use the 113s.

--
C'est bon
Soloman