Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
Technical discussion, description and outright lies
6 posts • Page 1 of 1
I've just been changing my tyres, and have reinstalled my tyre liners (blue Tuffy's, 120PSI, 23c).
On one set of wheels I've trimmed them, but they still bump on the overlap every time I ride over the joint on smooth roads. I didnt trim them to meet flush, cause that'd be darn near impossible, just a minor overlap and a tapering end.
On the other set wheels the liners are overlapped and skewed towards the sidewall to avoid the lump, but its still there, and now there's a heavy point in the wheel. If I spin the wheel and hold the axle, there is a definite wobble because of the overlap adding a point weight. Not that it would matter on the bike, cause my 90kg would stop that problem
Some people trim them, some dont. I believe manufacturers say not to.
What do you do?
Can you feel the ends?
MY RIDES: My Velospace Profile
The manufacturers recommend NOT trimming.
I've got untrimmed Mr Tuffy liners in my one bike with tubes. No bumps. I don't really know how you can get bumps - the pressure in the tube should equal out the bump if the tyres are sound.
I would suggest deflating the tyre most of the way and moving the bead around on the rim. I suspect the tube is pinched or the tyre's bead is not seated correctly.
Oh, and to taper the liner effectively, put the liner end between two sheets of grease-proof paper and iron it flat with the clothes iron*. The taper should be paper thin at the ends, otherwise the liner may abrade the tube (according to others - I haven't seen it happen to my tubes yet.)
(* If the wife is emotionally attached to the clothes iron, it might be wise to wait until she is not around. It doesn't do anything to the iron, but she won't believe some bloke from the internet who says "Trust Me!" ...)
I've used Slime Tyre liners at around 100 psi (on 23c road bike and on 26 in MTB slicks). Have trimmed them to fit, and not paid any attention to whether I tucked the cut end under the uncut end (as some people recommend).
Only trouble I've had with bumps was with an Innova 26 in slick tyre from T7 on the MTB. I tried dropping the pressure to 80 psi, but still got bumps. I concluded it was slack quality of the tyre bead - when I changed to a serfas barista slick had no more bumps trouble. Also found the Innova's punctured much more often.
But if I were you, I'd first make sure it wasn't your twins jumping around in the trailer
Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia
6 posts • Page 1 of 1
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