First time Exedra Max rear tyre

[1olbull]

Phil,
Agree regarding the Exedra Max rear. Running it with the 140/75R17 brought my speedo to "nuts-on".
Note that I made some changes to my post #26 to clarify and correct one small item.
All calcs are done front to rear. If the front is a larger circumference the result is positive.
If the rear circumference is larger, the result is negative.
All circumference differences are divided by the front circumferences.
If the circumference difference is negative, the ratio percentage will also be negative . . .
and of course always add a negative to a positive to obtain the correct percent spread.

 

[Mittzy]

Check the perforated ABS disk that's bolted to the rim. It's aluminium and will bend easily if knocked during tyre fitting. If it's been buckled slightly the reader won't pick up the rotation speed.
This happened to mine so I removed and flattened the plate to fix the problem.

+1

 

[Pete]

1olbull to another
I admire the work that's gone into this response is it snowing there ?

 

[1olbull]

1olbull to another
I admire the work that's gone into this response is it snowing there ?

Nope, too warm.
Lots rain! We have already exceeded our annual rainfall in just 3.5 months!

 

[Pete]

Nope, too warm.
Lots rain! We have already exceeded our annual rainfall in just 3.5 months!

AHHH, thought there must be a good reason for the research

 

[TURBO200R4]

Herman, 30 psi is a dangerously low pressure for that tire and I would definitely not recommend regular riding on that rear tire below 36 lbs. For most normal sized humans 38-42 lbs is the sweet zone for that tire. If it's a softer ride ye seek, then experiment with different shocks - not with your tire inflation.

motolink, if you are a "normal" sized human (175-225, let's say) I'd recommend 38-40 lbs up front and 40-42lbs in the rear tire. Experiment adding or losing a pound at a time but one tire at a time, preferably starting with the rear pressure.

didn't like 30 psi so i raised it to 32 and 32. Will try that for a while and see how it goes.
i guess i am a little lighter that the norm at 165 and i need to go to lighter springs on the back.

 

[1olbull]

i took a little trip (200 miles) so i raised them both to 32 psi seemed to work really well so i think i will leave them like that for a while to see how the tires wear.
now if some run car tires to get better milage i think that running 32psi is better.

Herman,
Do a chalk test if you wish to really dial in your air pressure. That will account for your weight and ride style.

 

[1olbull]

Can you help me here, since putting on the Bridgestone 255 rear tyre the ABS light comes on after riding about 15 kms, I can stop turn the ignition off restart and ride but the the light will come on in 15 km.

Sorry, the size is 240/ 55

If your front is standard size for your Roadster, then tis NOT an ECU issue.

 

[Joesmoe]

Here I go again . . . what is a chalk test, and how does one do it ?

You being a cop, would understand a chalk test I had one time -- early in my work career, some of the neighbors got irritated with me, and kept calling the cops for this and that, and I had a '71 Jaguar E-Type Series III that didn't see much use, and I couldn't store it in the garage, so it sat on the street. One day I got home from work, and there was a chalk mark on one of the tires, and I called the cops saying some vandal was going around putting chalk on the tire. It was a small town, the chief answered the phone and said, "I put that chalk mark there." A nice conversation ensued as he explained -- in the way that good sex counselors know that the real issue is not sex -- I need to work on the relations with my neighbors, and oh, not to worry about the chalk mark.

 

[TURBO200R4]

Herman,
Do a chalk test if you wish to really dial in your air pressure. That will account for your weight and ride style.

i do a chalk test on all wheel drive vehicles to show the customers not to mix different brand tires.
i seem to remember something like that but explain about the chalk.
i have kept a hand on the tire to make sure i don't over heat the tire.