How To Know When The Tyre Is Over?

[trialholic]

Hey, what´s up?

I use a Michelin trial compettion fron tyre with still 1/5" (5mm) knobbles, I´m not sure if is just paranoia but I have the "feeling" that I don´t have too much grip.

I set the pressure at 6.5 psi

How do you know when a tyre is over and need to be replaced? what´s the limit?

I ride mostly over hard terrain, wet rocks with lots of stones, no mud. Would do you suggest me to keep with Michelin or better try Dunlop?

Cheers

[old trials fanatic]

Drop the pressure to 4 psi then also try 3.5 psi then see how you go. The tyre is shot when the leading edge of the knobbles are rounded not square.

[timp]

5MM Knobbles!!!!!!!!!!

it was knackered about 6 months ago.

4 psi is a starting pressure. Bit less for mud and perhaps a bit more when dry and sunny on rocks.

If you only have 5 mm of tread then it worn out. I rarely take more than a couple of mm off the height of the tread. Its the squareness of the tread that grips. Rub your hand over the tread of a new tyre and a used tyre to feel the difference.

[lineaway]

If you are riding dry rock a tire will last until it can`t hold air any more! But at 6 psi you are not getting all the grip possible.

[trialholic]

6.5psi is too much...? but, i'm talking about the Front tyre..

[b40rt]

5 psi is ok for the front in rocky conditions, although you need to be careful, you don't realise how bad tyres are until you put new ones on !!