Michelin PR4 air pressure

[nervouswreck]

Thought, for what is worth, I would share some insight on air pressure for the PR4s according to Bob Lilly.   Bob works as a salesman for Hermy's BMW/Triumph and is an Iron Butt rider (finished 5th last time).   I was there getting new Pirelli STs and was talking with Bob about tires and told him I was very dissatisfied with the PR4s due to cupping on front and rear scalloping.   He always rode a 1200GS as long as I've know, but last year he traded the GS for a Trophy SE and he claims to love it, go figure.    But anyhow when he asked what air pressure I used in the Michelin's I told him 36 front 41 rear which is what I used in the original STs.   He has a set of PR4s on his TTSE and has not suffered any cupping/scalloping however he runs 41 psi front and 43 psi rear.     

For those who have or are getting the PR4s this may or may not make a difference for you.   I know mine starting cupping in as little as 3500 miles and I did try upping the psi to 39 on the front but apparently it was too little too late.     FYI.

[AVI.INC]

I all ways run 40 front 42 rear  on PR4GTs and have run 42/42 and consistently get 10,000-to 15,000 with little  to no cupping till the end.

[nervouswreck]

Originally Posted by AVI.INC

I all ways run 40 front 42 rear  on PR4GTs and have run 42/42 and consistently get 10,000-to 15,000 with little  to no cupping till the end.

I  guess I should have specified GTs.   Good for you AVI.INC, wish I had known I might have thought more of the GTs.    I might give them another try when the Angel STs are gone.    I put up with the PR4 GTs for 12202 miles and just had to get them off.   There wasn't much left anyhow.

[AVI.INC]

I have had very good luck with the PRO4GTs i have about 5,000 miles on them now and will be going on the Three Flags Classic  in two weeks and will change them when i get back if my luck holds out.

[davidcumbria]

Sorry please explain what this cupping looks like. I have found running the front at 38 versus 36 helps cornering particularly when setting off cold.

[johnbut]

Do you increase tyre pressure when carrying a passenger and luggage or stick to the recommended pressures?

[PhilInAthens]

PR4s command 38 front; 42 rear.  Handling is spot on.  4,000 miles on the current set and no wear is apparent.  Nice!

[azccj]

I have PR4GTs on my Trophy and I'm very impressed with how well the rear has worn in 11,000 miles. I believe I will get about 15,000 miles out of the rear. The front is another matter though. It has plenty of tread left but it does have a strange cupping pattern in 11,000 miles. I run slightly higher tire pressures, front 39 psi and rear 45 psi, than Triumph's recommended pressure.