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YOUR RESEARCH35 profile vs 30 profile rear tires
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I ran the caluclations when I made the switch and the result was my 285 were 2.89% faster.
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Suggestion · Original poster
I mentioned this to Dave at Wheel Enhancement and he concurred, saying that the 285/30 size wasn't a factory setting until 2002.
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Suggestion · Original poster
The acceleration doesn't seem to have been affected either, as I get to use my first and second gear a bit longer.
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I just put on 265/35/18 tires on the rear of my car for the first time....and I LOVE it. My shift points are all changed and it seems to feel like I get more use out of each gear now. I mentioned this to Dave at Wheel Enhancement and he concurred, saying that the 285/30 size wasn't a factory setting until 2002. This means that my car's gearing was tailored to the 265/35 size. And boy does it show.
Has anyone else with an older 996 noticed this?
Glad to hear you say that - I have the 265s on my car - I just had my rear rims refinished and the guy said, "you know you can put 285/30s on those." I hadn't thought of the need, as the car feels great. Now I know I won't have to going forward!
I don't mean to discredit what you feel, but the typical difference in diameter between a 265/35 and a 285/30 is less than the difference in tread wear from new vs. 2/32". Also, the 265/35 is taller. Going from bald 285s to new 265s is going taller, so if there is any perceptible difference, the car should feel about 3% slower.
Nope, not at all. The shift points are all different now, and it just seems more 'right' now. I agree, with the larger diameter I should lose some acceleration, but it also contributes to a higher top speed too (and possibly better mileage). Either way, it just feels better. The acceleration doesn't seem to have been affected either, as I get to use my first and second gear a bit longer.
285/30 rolling diameter is a little different for each brand of tire. I was just on TireRack checking out the specs for my coming wheel upgrade.
When looking at tire specs, I was TOTALLY SHOCKED at how heavy the Goodyear F1 G3s are in 265/35 size! I couldn't believe it:
30lbs
for the Goodyears, which are at least 5-6 pounds per tire heavier than a Michelin, and every other tire I looked at.
I really want these tires, but I'm not a fan of adding so much rotational intertia- which is part of the reason I'm getting BBS wheels.
That is very odd Paul. I went from 265/35 to 285/30 on my rears when I moved my MkI wheels (Sport Designs) to do track duty and added Carrera lightweights for DD duty and I notcied nothing. I ran the caluclations when I made the switch and the result was my 285 were 2.89% faster. Ad for the tires weights/rim weights, my new DD setup is almost 20# lighter total (all 4 combined).
The Carrera five spoke wheels are super light, and you would be saving a lot of unsprung weight with them. I am going to go to the Carrera III wheels next year.
As for my experience, it's really the change in how the gearing and shift points feel.
I guess I don't follow how the gearing would be affected. But you are right, the lightweights have seriously reduced unsprung weight. I should probably use them for the track!
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