Yes tube type rim i have the same kind of fantic wheel with irc on my triumph twin i only use one security bolt with that and the tyre has never moved.

OK, well that's me out of ideas - if the rim hasn't given problems before, the rimlocks are the same as used by others, it can only leave the tyre

just a thought why not swap the tyre from the Trifield over to the Fantic and the tyre off the Fantic onto the Trifield wheel then try and see if the problem follows the tyre or the wheel. OK i know it's a lot of hassle but i cant think of anything else to suggest.

just a thought why not swap the tyre from the Trifield over to the Fantic and the tyre off the Fantic onto the Trifield wheel then try and see if the problem follows the tyre or the wheel. OK i know it's a lot of hassle but i cant think of anything else to suggest.

I will probably have to do that Paul just wondered if anybody has had a similar problem.