How to Pick a 200TW Tire for HPDE & Autocross
To pick a 200TW tire for HPDE and autocross, start with your event's class rules: confirm the class actually requires a 200-treadwear tire before shopping. Then match the tire to your event — autocross rewards tires that come up to grip quickly from cold, while HPDE rewards tires that hold grip over long, heat-soaked sessions. Choose a size that fits your wheel width and clears the fender, favor a square setup so you can rotate for even wear, and set starting pressures from your placard or the tire maker's motorsport guidance, adjusting from what the tires tell you. Browse summer performance tires to see what fits your car.
What counts as a 200TW tire
A 200TW tire carries a 200 UTQG treadwear rating — the extreme-performance summer class that meets the 200-treadwear minimum used by most "street tire" classes in autocross (for example, SCCA Street) and time attack, while staying street-drivable. In other words, it's built to be legal for those classes yet capable of driving to and from the event. These sit at the grippy end of the high-performance tire spectrum. For a deeper comparison, see 200 treadwear vs summer performance tires.
Autocross vs HPDE: different demands
These two disciplines generally reward different tire behavior. Autocross runs are short, so a tire that reaches grip quickly from cold tends to shine. HPDE sessions run for many laps, so a tire that holds grip over long heat-soaked stints usually has the edge. The same 200TW tire rarely tops both, so it often helps to weigh which discipline you do more often. Compare candidates within the broader summer performance and high-performance ranges.
Picking a size
Overall diameter drives your gearing and speedometer accuracy, so it's worth calculating. The formula is: overall diameter (in) = rim + 2 × (section_width_mm × aspect ÷ 100) ÷ 25.4.
Worked examples with their exact computed diameters:
- 205/50R15 — 23.1 in overall, ~8.1 in section width, ~4.0 in sidewall
- 225/45R15 — 23.0 in overall, ~8.9 in section width, ~4.0 in sidewall
- 245/40R17 — 24.7 in overall, ~9.6 in section width
- 255/40R17 — 25.0 in overall, ~10.0 in section width
- 265/35R18 — 25.3 in overall, ~10.4 in section width
- 275/35R18 — 25.6 in overall, ~10.8 in section width
- 285/30R18 — 24.7 in overall, ~11.2 in section width, ~3.4 in sidewall
- 305/30R19 — 26.2 in overall, ~12.0 in section width
Notice how a wider tire isn't always taller: 285/30R18 (24.7 in) is shorter than 275/35R18 (25.6 in) because of the lower aspect ratio. A wider section width generally means a larger contact patch, but the tire must still fit your wheel width and clear the fender — verify fitment before buying. Running a square setup (the same size all around) lets you rotate tires to even out wear.
Living with a 200TW tire
Grip on a 200TW tire tends to change as it heat-cycles, so consistent drivers often log their sessions and watch wear to track how the tire is behaving over time. On a square setup, rotation helps spread wear so no single corner gives out early. For pressures, start from the vehicle placard or the tire maker's motorsport guidance and adjust based on tire-temperature and wear observations — there's no universal number that works for every car and course. Browse all tires when you're ready to size up options.
Frequently Asked Questions
What does 200TW mean?
It's a 200 UTQG treadwear rating — the extreme-performance summer class that meets the 200-treadwear minimum used by most "street tire" autocross and time-attack classes while staying street-drivable.
How do I pick the right size?
Use overall diameter = rim + 2 × (section_width_mm × aspect ÷ 100) ÷ 25.4 to check gearing, then confirm the tire fits your wheel width and clears the fender. For example, a 255/40R17 works out to 25.0 in overall, while a 305/30R19 comes to 26.2 in.
Is one 200TW tire good for both autocross and HPDE?
Rarely. Autocross rewards quick warm-up from cold, and HPDE rewards holding grip through long heat-soaked sessions — the same tire seldom tops both, so pick for whichever you do more.
What pressures should I run?
There's no universal number. Start from the vehicle placard or the tire maker's motorsport guidance, then adjust from tire-temperature and wear observations.