Rim sizes are Fr 21 x 1.85 and Rear 17 x 2.75.

Anybody fitted rim locks and if so which ones/sizes?

Thx.

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Rim locks are needed with a powerfull bike or very low tire pressures (<1.2bar). What are you planning to do.

ive thought about rim locks but there a hassel when doing tyres changes.

I tend to never really go below 22 PSI for fear of hitting a rock, generally ride 25 PSI most of the time.

I've got one in the front, because it came with the KTM wheel. Think it's a standard KTM plastic one, no idea what size. Don't have one in the back, and never bothered putting one in my Yam front.

Haven't had any issues in a year of rallying and a whole load of trail-riding, ran as low as 18psi at the Ryedale, but more generally about 23-25psi. I'd agree with Phil's thinking that you'll start getting pinch flats and/or denting rims before you spin tyres on the rims.

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400

All true, but it's good practice!

A spinning tyre that then grips and spins can easily slip enough to pull a valve out.

They really throw the balance out so not for anything other than off road.

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Meh, I've done about 8000 road miles since I changed my front end. Can't say I've noticed having a rimlock in the front above all the other vibrations from a big single on knobblies . Mind I don't bother balancing tyres either.

__________________
I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400

All adds to the excitement!

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nor me...as you said why bother on a big single with knobblies?!?

Also depends a little on trye construction...my rear Mitas has quite stiff side walls so i will drop that a few PSI lower than i might a tyre with not so stiff side walls. (im on about pinch flats rather than ripping the valve out)