My back wheel just spins and wont grip the metal roller.
I'm running a continental home trainer tyre at 110psi, should I be running these much lower than I'd run my GP4000 on the road?
How much pressure should the roller be putting on the tyre? Just about touching + a number of turns? If so, how many?
Wish I'd left the expensive tyre on there now, they just gripped even if they did develop flat spots.
From my experience has to be actually squashing the tyre
depends on the trainer and tyre etc. I would tighten one turn until the slipping stops 🙂
I'll try more pressure from the roller and drop the tyre down to 90psi, just a bit wary of loading the bearings in the trainer too much, they might be ~ the same size as the ones in the hub, but they must be spinning 30x faster?
Anyone tried wraping the roller in electrical tape or similar, or woudl that just get ripped straight off?
it simply can't cope with your awesome power output.
Tape would be gone in a very short space of time - given a bit of time, the metal roller itself will start to wear. TTs are made to be used as TT's. the instructions that come with it will tell you how tight against the tyre it has to be
I have the same issue. Is it just a case of keep tightening until it doesn't slip?
edit: Instructions long gone.
instructions that are with the one i've borrowed say 110 psi for a 25c tyre, and it visibly squashes the tyre.
On my last turbo the instructions were get the roller touching the rear tyre and the three full turns from there, which gave a bit of tyre squash
I'm a man, instrucctions were never read and now long gone!
It's a Cyclops MAG, I'll try tightening it a bit more then, I'm probably only half a turn into the tyre.
It's more to do with the tyre - trainer tyres are hard compound to prevent wear and keep noise down. They slip. Mine does, and I have the resistance unit well wound in.
bugger! Mine was slipping with a regular tyre, so i bought an as yet unfitted trainer tyre hoping it would solve this but now I hear ^ that this it's likely to make it worse.
100psi on the tyre. When the tyre/roller tension is right AND the turbo is warmed up(10mins of cycling should do it) coast down to stopped from 20mph when you stop pedaling should be about 12 secs.
Keep tightening it one turn at a time till it stops slipping...
From the manual
Attaching your bike:
Knob Resistance Unit: A. Tighten the resistance unit adjustment knob. Once the roller is in contact
with tire turn knob 2-2 1/2 rotations. Tighten more if tire slides.
Quick Cam Lever Resistance Unit: A. Rotate the cam lever in open position until the roller just contacts
the tire. Throw lever into closed position. Tighten more if tire slides.
I have one of these too - roller has to be well pressed into the tyre to prevent slippage, but if you try hard enough you can make it slip however tight it is
Cheers, saved me a lot of trial and error