Retrobike Forum Index

It is currently Sun Dec 04, 2016 5:01 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: Karakoram Seatpost Clamp
PostPosted: Sun Sep 08, 2013 6:00 pm 
Newbie

Joined: Sun Sep 08, 2013 5:34 pm
Posts: 3
Hi all,

I snapped my seatpost clamp and I'm hoping someone can help me figure out the correct size. My bike is a GT Karakoram, but I don't know exactly what year it is; maybe early to late 90s. It's black and purple has the groove tube for the cables. The seatpost is 26.4mm. The Clamp has the last number scratched off. It says 30._. I need help with that last number. I THINK it's 30.8, but there aren't a lot of options out there for that size. From what I can see (a little of the top part of the scratched off number), it's one of these possiblities: 30.0, 30.2, 30.3, 30.6, 30.8, or 30.9. Any help would be much appreciated.

Thanks!

Dave


Top
 Profile  
 
PostPosted: Mon Sep 09, 2013 12:47 am 
Devout Dirtbag

Joined: Sun May 09, 2010 12:53 pm
Posts: 137
Location: Great Britain
Seems strange. Assuming the seat clamp is 30.0mm, that's 3.6mm difference against your 26.4mm seat post. That would suggest a seat tube wall thickness at the clamp of 1.8mm, and I can't see how this could be.
I have a 1993 Karakoram "groove tuber" with an inner seatpost inner diameter of 26.8mm and and use a 29.6 seat clamp.
One good way to determine your seatpost diameter is to measure accurately (I've read elsewhere on this site that a peice of paper wrapped around the tube and accuratley cut and marked works well) its circumference then divide by Pi.


Top
 Profile  
 
PostPosted: Mon Sep 09, 2013 2:24 am 
Newbie

Joined: Sun Sep 08, 2013 5:34 pm
Posts: 3
Rock On. Thanks For The Reply.


Top
 Profile  
 
PostPosted: Mon Sep 09, 2013 6:08 am 
Newbie

Joined: Sun Sep 08, 2013 5:34 pm
Posts: 3
Figured out that I probably don't actually need the clamp, but just the handle for QR...which is a 6 x 60mm if anyone is wondering...Thanks for the help though!

Dave


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Bing [Bot], Carsen80, MSNbot Media, schwartzy16 and 16 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group