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Old 10-21-2004, 01:09 PM   #1
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Default Foam tire size?

What do you guys cut your tires too for club races? Also, when the tires get smaller, how do you adjust the droop per mm lost off of the tire?
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Old 10-21-2004, 01:36 PM   #2
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I cut them to 2.27-2.28 for club racing. At nationals, I'll start at 2.23-2.24 depending...(corrected- good catch)

Remmeber to round the edges and seal them with a light dose of CA glue to reduce the chance of chuncking. Also, make sure your body doesn't rub the tire

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Old 10-21-2004, 02:34 PM   #3
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Shouldn't it be the other way around? 2.3 is larger than 2.27. Wouldn't you want a smaller tire for nationals?
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Old 10-21-2004, 03:13 PM   #4
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depends what kinda budget your on...if you have an endless amount of tyres in your box then cut them really small..but at nationals you tend to drive harder and quicker so you will wear your tyres more/quicker
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Old 10-21-2004, 03:18 PM   #5
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In actuality, the foam tires last alot longer as they get smaller in diameter. They also get a little more firm as they approach the rim. Also, the smaller they are the longer you need to keep tire compound in them in order to keep traction the entire race.

There are advantages to using smaller tires such as less sprung weight, less rotating mass, and faster spin-up for acceleration, but again you need to be budget-minded too.

If you want them to last, start at 2.28, and skim them after every race day. Also, remeber to rotate them every round so one doesn't wear faster or unevenly.

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Old 10-21-2004, 04:31 PM   #6
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I just cut them down to 2.37. I will see how that works for now.
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Old 10-21-2004, 07:05 PM   #7
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I cut my new tires to 60mm. Any taller than that and I cannot get the ride height and droop that I need. For every 1 mm change in tire height results in a .5mm change in droop.
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Old 10-21-2004, 07:15 PM   #8
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I start my tires at 59mm ( about 2.30). If you have a TC3, yeah, the car will run better a lot of times on small tires. That being said, each car is different. My Pro4, with the roll centers I have setup on the car, likes about 2.30-2.24. After 2.24 that car starts to suck. YMMV
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