Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the February Giveaway for a Reflective Backpack & Spine Protector from RiderBag

Replacing Crankset on Vintage Groupset. Am I doing this right?
I have an old bike with a '93 Shimano RX100 groupset on it. Two of the chain rings are bent and rather than replace them, I'm thinking of replacing the crankset with this Shimano Acera FC-M361. (https://www.jensonusa.com/Shimano-Acera-M361-Square-Crankset/?utm_source=FRGL&utm_medium=organic&pt_source=googleads&pt_medium=cpc&pt_campaign=shopping_us&pt_keyword=&gclid=EAIaIQobChMI5K3qhLOx1gIVCyaGCh1YGwB8EAQYAiABEgJuLPD_BwE&avad=55963_a16c41e8d&rpi=41227&utm_medium=AVLK)

My spindle is JIS. I haven't taken apart anything yet, but after looking up specs online, I'm fairly certain my current one is 113 mm and the one on the new crankset is 122.5 mm. Is that something that could be a problem? Or is that exactly what the adjustable cup is for? This is my first go at any type of bike repair beyond the basic tire, chain, tube stuff. Am I on the right path? Are there any red flags that I don't see?
Hello Summer. The adjustable cup allows for very small adjustments in pressure on the bearings. A difference of 10mm or so between the old and new spindle length is far beyond the adjustable cup's range. You can try mounting the new crankset on the old, shorter spindle, but you're likely to encounter problems with either the inner chainring or the crankarm hitting the chainstay as you make revolutions.

You most likely are going to have to get the longer spindle. It probably is about time to replace the BB anyway. I suggest you consult our repair guides here at the site for help with the installation. Best wishes, and let us know how it goes!
BikeRide.com - The Ride Starts Here!

Possibly Related Threads...
Last Post
10-07-2010, 02:36 AM
Last Post: iceman8

Forum Jump:

10 Latest Posts
How to stay safe while biking?
Today 01:07 AM
Mountain Bike Purchase Advice
02-24-2021 06:33 PM
Restoration of a 1980 Falcon Road Bike
02-24-2021 05:39 PM
Pedals: Clip vs. Clipless
02-24-2021 05:33 PM
Just bought a 2021 TREK MARLIN 6 MTB
02-24-2021 05:28 PM
Favorite MTB brand?
02-24-2021 05:25 PM
New bike
02-24-2021 05:20 PM
What kind of frame do I have here?
02-24-2021 03:24 AM
Chain for specialized rockhopper
02-23-2021 03:12 PM
1983 Trek 720
02-21-2021 08:04 PM

Top 5 Posters This Month
no avatar 1. Criminal
11 posts
no avatar 2. Jesper
6 posts
no avatar 3. ILv2MTB
5 posts
no avatar 4. Painkiller
4 posts
no avatar 5. Eddieley
4 posts