Crank bolt sizes

astro · 11-18-2009, 01:01 AM

Hi, bit of a newbie to bike repair. I'm looking to change the front gears on my mountain bike. I've got the correct crank pulling tool, unfortunately I don't have the correct socket to remove the crank bolt. The bolt is bigger than the 14mm socket but smaller than the 17mm. Are there standard sizes of crank bolts (this is a Shimano gear-set, bike bought in the Netherlands, roughly 5-10 years old)? If so what is the most likely size I'll need to buy?

Joe_W · 11-18-2009, 06:00 AM

OK, if the crank set is Shimano, then the removing tool will fit the cranks (but not necessarily the bolt... been there). The bolt could be 15mm or 16mm, a regular 16mm nut will not fit inside the hole in the crank. The tool to remove small spark plugs could fit (it is 16mm), it did for me. Some bike shops have 15mm and 16mm nuts that are turned down to fit inside the crank hole.

10 Latest Posts
Campagnolo Freehub Lockrings Yesterday 05:13 AM
Biking and running apps 09-30-2022 08:27 PM
Newbie 09-30-2022 08:20 PM
Campy 10 speed cassettes 09-30-2022 09:53 AM
Schwinn Le Tour sagging chain 09-30-2022 07:19 AM
Where are you from and What is your favo... 09-29-2022 05:03 PM
Central Oregon checking in 09-29-2022 11:34 AM
What are your best biking places in your... 09-29-2022 11:33 AM
First Metric Century 09-27-2022 10:09 PM
Has anyone used tubeless tires without s... 09-24-2022 03:21 PM

Join BikeRide on Strava

Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom