Thorn Cycles Forum

Technical => Transmission => Topic started by: crazytraveler on July 02, 2014, 09:14:22 PM

Title: How to tighten the bottom bracket
Post by: crazytraveler on July 02, 2014, 09:14:22 PM: I just got all the tools needed (according to Thorn mechanics) to tighten my bottom bracket, including a 1/2" drive, any recommendations or any good video or post about to how to proceed?

Thorn mechanic told me to tighten before one of the sides, I think he said left, but I cannot remember 100%. Do you know?

Thanks!
Title: Re: How to tighten the bottom bracket
Post by: Andre Jute on July 02, 2014, 09:24:00 PM: Park Tools has videos for common jobs around the bike. If you're an aspiring amateur mechanic, you should also have Park's Blue Book. See these links:
http://www.parktool.com
http://www.parktool.com/videos
http://www.parktool.com/category/books-1
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 02, 2014, 09:27:36 PM: Quote from: Andre Jute on July 02, 2014, 09:24:00 PM
Park Tools has videos for common jobs around the bike. If you're an aspiring amateur mechanic, you should also have Park's Blue Book. See these links:
http://www.parktool.com
http://www.parktool.com/videos
http://www.parktool.com/category/books-1

Thanks. ;)
Title: Re: How to tighten the bottom bracket
Post by: Dave Whittle Thorn Workshop on July 03, 2014, 08:41:58 AM: Quote
Thorn mechanic told me to tighten before one of the sides, I think he said left, but I cannot remember 100%. Do you know?

You need to tighten the right hand side (drive side) fully before screwing the left hand cup against it and tightening.

Its important that the right hand cup tightens against the frame/eccentric not the left hand cup.
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 03, 2014, 12:03:38 PM: Quote from: Dave Whittle Thorn Workshop on July 03, 2014, 08:41:58 AM
You need to tighten the right hand side (drive side) fully before screwing the left hand cup against it and tightening.

Its important that the right hand cup tightens against the frame/eccentric not the left hand cup.

Got it, thank you very much. ;-)
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 03, 2014, 07:52:29 PM: Quote from: Dave Whittle Thorn Workshop on July 03, 2014, 08:41:58 AM
You need to tighten the right hand side (drive side) fully before screwing the left hand cup against it and tightening.

Its important that the right hand cup tightens against the frame/eccentric not the left hand cup.

I am on the process of doing it...

I understand then that I should untighten the left first, tighten the right and after that tighten the left.
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 03, 2014, 07:56:25 PM: When I try to untighten the bottom bracket the eccentric moves. What should I do?
Title: Re: How to tighten the bottom bracket
Post by: jags on July 03, 2014, 09:16:22 PM: this any help
https://www.youtube.com/watch?v=OrGKvgahgE8

jags.
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 03, 2014, 10:23:21 PM: I finally managed, it wasn't that hard once you find the right directions and hold the bike steady.

Now I have to go out and test if the creeking is gone...
Title: Re: How to tighten the bottom bracket
Post by: keleher on July 10, 2014, 02:32:09 PM: Quote from: crazytraveler on July 03, 2014, 10:23:21 PM
I finally managed, it wasn't that hard once you find the right directions and hold the bike steady.

Now I have to go out and test if the creeking is gone...

How did it work? I'm having creaks from down there on my nomad mk2. And were the "correct" directions just those in this thread, the youtube, or something else?

Thanks,
pete
Title: Re: How to tighten the bottom bracket
Post by: mickeg on July 11, 2014, 03:29:11 PM: "Creaks from down there" can also be a loose square taper crankarm. Was a crank arm recently installed?
Title: Re: How to tighten the bottom bracket
Post by: crazytraveler on July 11, 2014, 11:17:44 PM: Quote from: keleher on July 10, 2014, 02:32:09 PM
How did it work? I'm having creaks from down there on my nomad mk2. And were the "correct" directions just those in this thread, the youtube, or something else?

Thanks,
pete

As said in this post you need to unscrew first the left side and after that the right side. And when you screw it back you put first the right until the end and after that the left side.