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From: Catrike Ryder <Soloman@old.bikers.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Thinking of changing crank 165m to 175mm
Date: Thu, 20 Feb 2025 05:39:43 -0500
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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