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

New: Take part in the May Giveaway for DERUIZ LAVA e-bike worth $1699


Replacing crankset - chainline and bottom bracket question
#1
Hi all,

I have a bike that I'm doing up as a project and I need to replace the bottom bracket (square taper). Since the front chainring (single, 46 teeth) is pretty badly worn I was going to take the opportunity and replace that as well. But what to get as replacement?

At the back I've got a 6-speed freewheel with a chain line of 38 mm. The bike is nothing special, it's more for fun and the learning experience (my first project..), so I'd like to keep the costs down. I was looking at some budget cranksets on ebay but most of them don't specify what kind of bottom bracket length to use. How do I find a crankset/bottom bracket combination that will work and also give me a narrow enough chain line? Is it just a matter of trial and error (that could get quite expensive if I'm unlucky I guess..) or is there something I should look out for?

I found a cheap one that for a change specified BB and chain line: 131 mm BB and 50 mm chain line.
https://www.rosebikes.com/article/m-wave-single-crankset/aid:485066
Can I just use a shorter BB to get a narrower chain line or will that not fit? Do you know of a combination that could work?

Thanks a lot!
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
What are your thoughts on E-bikes?
Today 08:57 AM
How much do you bike a year
Today 07:47 AM
Installed Shimano Zee on GT Transeo 5.0
Yesterday 07:57 PM
E-Bike
Yesterday 02:50 AM
Unknown brand, should I buy or not?
Yesterday 02:01 AM
Trek 2300 Vs Triban RC500 (Buy advice)
Yesterday 01:52 AM
Help with a wheel please !
05-17-2022 08:08 PM
Entry level triathlon bike recs?
05-17-2022 12:59 AM
Have you Ever Tried an Electric Bike?
05-16-2022 07:51 PM
Bobbing seems to make my bike go faster
05-16-2022 07:46 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
28 posts
no avatar 2. ReapThaWhirlwind
22 posts
no avatar 3. tran thanh
17 posts
no avatar 4. ichitan
7 posts
no avatar 5. Criminal
5 posts