Jump to content

Using Tubeless Irc Or Michelin On Twinshock


cleanorbust
 Share

Recommended Posts

Probably a question that's been done to death at some point in the past but has anyone experiences good or bad of using a rear tubeless IRC or Michelin tyre with a tube on a twinshock (mine's an SWM). I've read that grinding some rubber off the bead helps the tyre to seat properly in the rim.

Edited by cleanorbust
Link to comment
Share on other sites

 

 
 

I recall a thread here a while ago about this. What I recall is that the IRC tires have a slightly larger inside diameter then the Michelin. As a result the IRC tires come off the beads on some tube type rims unless they are run with more pressure.

I have an IRC with a tube and rim lock on my '74 TY250 that I run at about 11 PSI and have never had the bead come off. I don't compete with that bike, it's just a play bike for me and a buddy bike for new riders to learn on so the higher pressure is not an issue.

Link to comment
Share on other sites

 
 

Tubed IRC have softer sidewalls and can roll off cambers or the tops of rocks and can even skew the bike sideways under hard acceleration when run at normal trials pressures of 3 - 5psi.

How badly this is evident depends upon the type or level of sections being ridden and the weight of the rider. The heavier you are the worse they'll be as rider weight will squash the sidewalls more making them more prone to roll. Increasing the pressure to hold it on the rim doesn't work for trials because as soon as you go over 5psi grip is lost. So you either roll around on it or spin up...

It does seem though that they are inconsistent and some aren't as bad as others, although a few road trials will soften the better examples up a bit.

On the Jap rims they stay out on the bead until you let them down to about 10psi and then 'plop' - any lower and a section will drop into the well. Generally they are ok on the old Akront rims with no need to trim the bead. Trimming it would make it a more sure fit I guess but I've never done it in the past. Most of mine are tubeless rims now.

Link to comment
Share on other sites

 

Is there any reason why you prefer to run a tubeless tyre? Why not just

use a tubed type tyre?

I use a tubed IRC tyre on my Ty with no problems, even when running

low tyre pressures.

I run tubeless on my modern bike and the hand-me-downs get used on the TY.

Link to comment
Share on other sites

 
 
  • 2 weeks later...

Hi Cleanorbust thanks for posting this question

This one has really got me I need a new back tyre so i have had a look around And the IRC with its soft rubber looked like the one to go for, and i was thinking i need the tube type because i have a Bultaco. But most seem to think the tubeless one is better.

im a bit of a light weight at 70kg so im thinking i may get away with the softer walls on the tube tyre at least it will stay on the rim it seems like there is no real win here just work arounds, unless i fit a tubeless rim to my back wheel, my back wheel needs new spokes plus relining so may be a good time to fit a new rim.

Thanks for all the help

BR

Edited by bultacorock
Link to comment
Share on other sites

 

I have fitted Michelin X-Lite tires with inner tubes to my SWM which still has the Acront red label rims. The combination works quite well.

The tires stay good on the rims, it had sometimes occurred that a partial section of the tube went off the tire bed, (around 10 - 15 cm). But only if you have very low air pressure. I did not recognized it at once first a week later. I pumped up the rear tire until the tire sat again right on the rim. I run around 0.4 bar in the rear tire works very good. The Michelin X-Lite's are one of the easiest way to save some weight (over a kg).

I will probably mount them too to my TY together with a tubeliss inner tube

..

  • Like 1
Link to comment
Share on other sites

 
 
 
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...