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Help lurker with air pressures

Old 06-08-2005, 06:43 AM
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Re: Help lurker with air pressures

I don't run dunlops anymore but IIRC 42 is max. This keeps the tire cooler thus lasting longer. For better traction/feedback, run a lower psi although it sounds like your tires are "cooked" all ready.

Is the ZR a track compound? If so, you don't get many heat cycles out of these kinds of tires before they "go off" and don't feel as good.
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Old 06-08-2005, 07:30 AM
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Honda Manual calls for 36 front & 42 rear. This is quite a bit more than other bikes call for, but Dunlops website makes the same recommendation. Most sources I've seen recommend 30 - 32 PSI for trackdays, so I think it's unlikely that your tires are overheating. Heat is created by carcass flex & more heat in the tires helps them work (stick) better...up to a point.
Metzeler's website calls for 32 front & 36 rear on the Super Hawk.
I think with your agressive riding style that the standard pressures are too high for you, so you're getting too small a contact patch. Try the Metzeler recommendation & see what you think.
Also, I read somewhere this year (I think it was WEBBIKEWORLD.com) that the optimal pressure for the track could be determined based on the differential between cold & hot tire pressures. The idea was to achieve a 10% differential on the front & a 20% differential on the rear.
See attached chart that I made up. Note: I haven't had time to check this out, so it's not gospel as far as I'm concerned.

Check cold pressure, then run bike under expected operating speed & conditions. Check hot pressures. Hot pressure should vary 10% on front & 20% on the rear for optimum use.

First column is Cold Pressure, second one is Plus 10% (front) and third column is Plus 20% (rear).

Cold
Pressure Plus 10% Plus 20%
28 31 34
30 33 36
31 34 37
32 35 38
33 36 40
34 37 41
35 39 42
36 40 43
37 41 44
38 42 46
39 43 47
40 44 48
41 45 49
42 46 50

Any one else, such as racers, have some knowledge about this?
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Old 06-08-2005, 10:58 AM
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The dunlop ZR's are a street tire. THe GP's & GP A's are the track tires.
I use the 208's on the street and run the rear at 36psi, the front at 32psi.
If you fill them to 42 they do get a slippery feeling to them, but will extend the mileage you get from them.
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