Mounting tyres properly - not sitting on rim correctly?

Home:Ballyhoura

Hey guys, when I bought my last set of new tyres, Vittoria Rubino Pro's, and I mounted them on the rim they didn't sit properly. When the wheel was spun, you could see mainly a vertical and a slight horizontal wobble. It seemed as if the groove had not sat into the clinchers or something. However, when I pumped it up to the maximum allowed pressure 120PSI, I heard it suddenly shift/jump into place from the noise of it. NICE !!

Anyway, I got my Pro 3 Race's in the post today, and they went on easily once pumped to a decent pressure. The trouble is that I also got this trainer specipic tyre which I cannot manage to get on correctly. It is a stiffer/harder compound rubber...maybe that has something to do with it? There always seems to be a flat spot/wobble where it is not sitting correctly on the rim (which is terrible and causes it to slip on the trainer with every revolution).

I read somewhere that for some tyres (for Pro 3 Races in actual fact) "you mount the tire towards the valve core, not away from it". What does this actually mean? I used to work in a bike shop part-time so I'm fairly handy with bikes...I'm just puzzeled by this! Maybe it's the rim (although I seriously doubt it, it's a new bike with nice Bontrager wheels!)

Anyway, I would really appreciate any help. Thanks in advance!

P.S. It actually seems quieter than a standard tyre at the moment!

SetOverSet

Home:Ballyhoura wrote: »

I read somewhere that for some tyres (for Pro 3 Races in actual fact) "you mount the tire towards the valve core, not away from it". What does this actually mean? I used to work in a bike shop part-time so I'm fairly handy with bikes...I'm just puzzeled by this! Maybe it's the rim (although I seriously doubt it, it's a new bike with nice Bontrager wheels!)

The only thing I can think of is that you start mounting the tire opposite the valve, working around and mounting the side adjacent to the valve last...

NewDubliner

After mounting the tyre, inflate the tube very slightly, just enough for it to take shape.Then work around the wheel squeezing the bead of the tyre down into the rim, encouraging the tube to 'pop-up' inside of the tyre as you do it. Try and look under the bead and make sure its not resting on the tube. At the valve, you should be able to feel the base of the valve up inside the tyre rather than the bead resting on top of it. Jiggle the valve up through the hole, towards the tyre.

Once you inflate fully, the tube should press the bead further down into the rim, giving a secure, even, fit. It's worth spending time getting it right examining the bead (clincher) carefully, or you'll be sorry later.

victorcarrera

Try using a little washing up liquid to lubricate the beading and rim.
Increase tyre pressure in 10psi intervals and bounce wheel on hard surface between each increase.
Wash rim and tyre when finished.