Perhaps something to add into the debate - I recently read a suggestion that manufacturers (tyre and vehicle) have to take into account ever more stringent regulations regarding noise output, and this may affect their recommendations, so they might not necessarily recommend a pressure that is ideal for maximum grip with fast road use and higher temperatures (higher pressure being quieter). The suggestion is that the "recommended" pressures can therefore in some cases be higher than you might want. In the example I was looking at, the question was why Triumph recommend a rear pressure of 42 psi for the Street Triple, and 36 for the Daytona 675 (same wheels and tyres, same front pressure recommendation) - nobody seems sure whether it is something to do with assumptions about rider weight, pillion use, or the fact that the faired machine produces less other noise so can "get away" with a noisier back tyre.
CR I contacted Pirrelli recently inquiring about tyre pressures , was suprised by their fast response and recommendation for pressures which were quite a bit higher than I had been using.
Wont the bikes weight and BHP/Torque be different? That's promising. I like the last line in this: Tire Pressure - The Inside Story - I Ride My Own
Pressures wont affect your holding a line much, not if they are in the range. How do you know they are mot getting wamr or holdimg heat? What are you using as a gauge? If you have slow turn in that could be profile or chassis set up, neither of which will be affected by pressures Change the tyres
Smart arse "After he/she recovers from the shock of your remarkable intelligence, you will have your baseline for making adjustments to tire pressure"
They just seem to be slower to get to a point where the back end does not spin up. I need to get the ride height checked, on my to-do list, so maybe that is it. I don't really want to be spending £250+ on new tyres unless I have tried the simple/free options first.
Spinning the rear up? Who are you, Wayne Rainey?! These are not hypersports tyres straight off the warmers. Give it the beans at max torque and the rear will slip a little but amazed you'd feel it under normal circumstances
Certainly not Wayne Rainey and not even giving it that many beans but I can feel it lose traction. and not at any great lean angle either. Pirelli just came back with: Front-32 Psi (2.2 Bar) Rear-36 Psi (2.5 Bar) Which was a surprise.
I thought you'd done this when you were asking about fork height thru yokes etc Sounds about right to me, surprised it's "spinning up" unless very cold tyres & road, how old are they?
No, still on to-do list. I don't have a ride height tool so need to get my arse up to Birmingham. Tyres are 2011. Only spin when cold, but for longer than I would expect them too warm up hence why I was thinking under inflated, or mildly damp. They don't spin when up to proper temp. Guess its up to Birmingham. Then time to start fiddling with the suspension.
How long into a ride do you feel its still slipping? If is quite a while and you're not giving it the beans either its a mental thing (arrgghh feels like its slipping...all been there) or you are hitting something on the road or something is really wrong I ended up juncking a pair of tyres because they always felt the rear was letting go. It wasnt. It was rider
Last time was after about 15 mins in town, not above 30mph, then as I opened her up at the national speed signs slightly banked over she stepped out. Not enough to lift me out the seat or anything nasty but she did let go.