Retrobike Forum Index

It is currently Wed Oct 24, 2018 7:31 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: Mon Apr 23, 2018 10:11 pm 
Dirt Disciple

Joined: Thu Mar 25, 2010 2:04 pm
Posts: 10
27.0 seat post is slipping in the frame and I've stripped the threads in the seat post clamp trying to tighten.

So; any chance a 27.0 is too small? Everything I've read says 27.0 should be the right size. And, what size clamp do I need to get to replace the one I've goosed?

Ta


Top
 Profile  
 
PostPosted: Mon Apr 23, 2018 11:39 pm 
Old School Grand Master
User avatar

Joined: Thu Nov 26, 2015 7:29 pm
Posts: 4282
Location: peak district
Kona post sizes can vary. Some say a 27.2 fits fine some say no way will it :)

Personally i always try different dia posts and go with the size that fits my frame, regardless of what others use, fairly easy to see what fits and what doesnt.

And was the clamp the right size?

Mark


Top
 Profile  
 
PostPosted: Tue Apr 24, 2018 8:38 am 
Retro Guru
User avatar

Joined: Tue Jul 15, 2008 7:20 am
Posts: 1909
Location: Austria
27,0 mm is the size of my OE spec. seatpost on my 94 Explosif

+ 1 for the clamp


Top
 Profile  
 
PostPosted: Tue Apr 24, 2018 9:52 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 9193
Location: New Forest, UK
Generally 27.0 is right, however if you have a frame that had no trace of ovalisation from welding then a 27.2 may fit. I've had a couple of Konas over the years like that. The easy test is whether your 27.0 post has any trace of a front/back or sideways wobble when dry fitted with no clamp. If you can wobble it go up to 27.2.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 4:10 pm 
retrobike rider
retrobike rider
User avatar

Joined: Wed Apr 15, 2009 1:08 pm
Posts: 3723
Location: Woking
I had the same problem on my '93. I cut a shim from a plastic milk bottle and placed it under the seat clamp. This gripped the seat tube tighter and won't damage the paint either. I've had no slipping since.

SP


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 7:43 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri Aug 08, 2008 2:36 pm
Posts: 17818
Location: Yorkshire, England
29.8/30.0 for the other question you asked.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Tue Apr 24, 2018 9:24 pm 
Retro Guru
User avatar

Joined: Sun Aug 28, 2011 9:43 am
Posts: 388
Location: near paris
Hello

On my 94' its 27.2 but as people said above every frame could be differents....
Got two kilauea from 94'too and one is 27 the other 27.2....
You must try both size to be sure

Cheers


Top
 Profile  
 
 Post subject: Re:
PostPosted: Wed Apr 25, 2018 5:42 am 
Retro Guru
User avatar

Joined: Thu Apr 30, 2009 9:47 pm
Posts: 884
Location: Newbury, Berkshire
Another consideration is the accuracy of the Seatpost.

Below is a picture of a 27.2mm Seatpost that measures less that 27.0mm at 26.96mm :shock: . I think it is possible that some riders say that their Kona needs a 27.2mm Seatpost, when the Post that they have fitted actually measures nearer the spec of the required 27.0mm.

As hamster says, try a dry run. If the Seatpost sips into the frame under its own weight, then go up a size.

ImageDscn2564 by Philip Mock, on Flickr

Pip


Top
 Profile  
 
 Post subject: Re:
PostPosted: Wed Apr 25, 2018 8:09 pm 
retrobike rider
retrobike rider
User avatar

Joined: Fri May 14, 2010 10:08 pm
Posts: 1376
Location: West Midlands
Same as the above, had a zoom seatpost stamped up as 26.6mm that kept slipping (not in a Kona), it actually measured nearer to 26.4mm. Measure the seatpost that you're using if you can or try a different one.


Top
 Profile  
 
 Post subject: Re:
PostPosted: Fri Apr 27, 2018 5:24 pm 
Dirt Disciple

Joined: Thu Mar 25, 2010 2:04 pm
Posts: 10
Thanks all. You are wonderful people.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: 24pouces, kase1983 and 12 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