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PostPosted: Fri Oct 05, 2018 9:46 am 
Dirt Disciple

Joined: Tue Sep 17, 2013 7:06 pm
Posts: 49
Hi all,

I've just converted one MTB to tubeless using brand new Conti tubeless ready tyres, and a Stan's conversion kit, on DT Swiss rims.

All looked good, until I noticed that the tyres were dropping to 10-20psi after each ride. A soapy water test revealed about 10 tiny holes on the tread, presumably little punctures, with a tiny stream of bubbles. In the photo you can see the stream of bubbles in the main tread. There are no leaks anywhere else, and I know it is these holes that are the problem, as their size makes sense that it takes about 24 hours for the tyres to deflate.

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Screen Shot 2018-10-05 at 09.43.06.jpg
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I kept rotating the tyres, added more sealant etc, ran them at 58psi to theoretically force the sealant in to the holes, but still air leaks out of the same little holes, they just won't seal. Even if I rotate the tyres so the hole is at the bottom, and theoretically all the sealant is sat above it, they just won't seal.

I've taken the tyres off and scrubbed the inner wall to get rid of any manufacture residue, but no change.

I've contacted Stan's and their only answer is that Contis are notoriously porous and take a while to seal. Its been 8 weeks.

I now have little confidence that if I get an actual puncture, it is going to seal. This is driving me mad!

Am I missing something, or does Stan's just not work with Conti tyres?


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 Post subject: Re:
PostPosted: Fri Oct 05, 2018 12:01 pm 
Old School Hero

Joined: Tue Aug 21, 2018 3:43 pm
Posts: 229
Location: Cambridgeshire - flatlands (the horror, the horror)
hmmm....have a look at this thread - lower down there is a reference to the precise steps re Contis - coating the inner...

http://forums.mtbr.com/wheels-tires/con ... 05822.html


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PostPosted: Fri Oct 05, 2018 12:46 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3108
Have you actually gone out and ridden them. Or do they go down too quickly.


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 Post subject: Re:
PostPosted: Fri Oct 05, 2018 12:47 pm 
Dirt Disciple

Joined: Tue Sep 17, 2013 7:06 pm
Posts: 49
I’ve riden them about 10 times. They take about 24 hours to go down, so not noticeable on the ride itself.


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PostPosted: Fri Oct 05, 2018 12:50 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3108
Thats how i got my non-tubeless contis to seal. Took a few weeks.

How well did you shake the stans?


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 Post subject: Re:
PostPosted: Fri Oct 05, 2018 5:16 pm 
Dirt Disciple

Joined: Tue Sep 17, 2013 7:06 pm
Posts: 49
I Shook it loads and loads. These are tubeless coatis though, so they should seal. the holes are actually tiny little pinprick punctures as I can see the cut on the outside. The stuff just doesn't work. Ive had a look at the Conti instructions (thanks for pointing me that way) and the revo looks much thicker, and looks like it coats the inside more. The Stan's is just like milk.


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PostPosted: Tue Oct 09, 2018 2:16 pm 
Retro Guru
User avatar

Joined: Sun Mar 04, 2012 9:33 pm
Posts: 431
Location: The Kingdom of Wessex
meybe too cold to seal - try pumping up and parking inside your green house - that helped one of my bikes


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 Post subject: Re:
PostPosted: Tue Oct 09, 2018 3:57 pm 
BoTM Winner
BoTM Winner

Joined: Thu Jan 19, 2006 1:23 pm
Posts: 2941
Location: NW England
I run stans in my conti tyres, no problems now - its usually the sidewalls that are leaky initially and have to be sealed by laying the wheel on its side on a bucket (so it sits flat) overnight.


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