Tyre sizes

[BBK]

Question, when talking drag racing, what would be better...

245/40
255/40
245/35
255/35

When going to a 255 on the rear, do you need to reduce the profile that one size?

And same question for street day to day use?

[Jeef Beef]

I am front: 225/40R18; rear: 255/35R18. Which is essentially the stock profiles but +1 on the width. I am lowered by ~30mm and there are no rubbing issues.

You don't want to reduce the profile size anymore as the ride quality on our cars aren't great to begin with. 40 front 35 rear is fine.

EDIT: right sorry, read your first post about drag racing. Above is my street/track setup and I am too much of a cheapass to get a set of rims.

Drag racing you want as FAT as possible in the rears, preferably 16' drag radials with big profile. I think people are even running 275. 18s are too big for drag.

[Stuart@BMRAutowerkes]

out of those, 255/40 would be the best choice from those 4 for drags. not the ideal drag racing tyre, but the best out of those 4 sizes.

[Dec540]

Good to check whats legal in terms of rolling diameter.. Assuming this will be for track and street.

[Alpha Trion]

Originally Posted by Jeef Beef

preferably 16' drag radials with big profile. I think people are even running 275. 18s are too big for drag.

be careful when running much smaller wheels.. you will rev a lot quicker and characteristics will change.

drag cars have their gearing matched with the wheel size being a big part of it! but yes get as fat as you can in the back for as much traction as possible BUT if you are running a stock car keep the tyres and wheels size stock. Sounds crazy but there's a science behind it all- rolling diameters etc

[ND40oz]

Originally Posted by blackonblack135

be careful when running much smaller wheels.. you will rev a lot quicker and characteristics will change.

drag cars have their gearing matched with the wheel size being a big part of it! but yes get as fat as you can in the back for as much traction as possible BUT if you are running a stock car keep the tyres and wheels size stock. Sounds crazy but there's a science behind it all- rolling diameters etc

Wheel size shouldn't matter as long as it clears the calipers, rolling circumference/diameter is what you'd like to keep as close as possible, which is what JB is talking about when he says a large profile. A 275/40/16 is just a tad bit smaller then a 245/35/18 in rolling circumference/diameter.

[Jeef Beef]

Originally Posted by ND40oz

Wheel size shouldn't matter as long as it clears the calipers, rolling circumference/diameter is what you'd like to keep as close as possible, which is what JB is talking about when he says a large profile. A 275/40/16 is just a tad bit smaller then a 245/35/18 in rolling circumference/diameter.

Yep Keep the rolling diameter similar to stock, running smaller tyres with larger rubber will be an advantage in drag.

[Taymaishu]

255/40. No questions asked.

[MrBlonde]

You want the tallest and widest tyres that fit with the highest sidewall.

255/50 R16 seems to be the drag radial size of choice

[BBK]

Sorry, meant for use with the stock wheels...

[130iguy]

regardless of size if you are buying locally call ahead, i rang 3 shops and visited 5 others in my travels today and not one had the sizes in stock

[Jeef Beef]

Originally Posted by 130iguy

regardless of size if you are buying locally call ahead, i rang 3 shops and visited 5 others in my travels today and not one had the sizes in stock

Lesson learnt: buy from tirerack

[MrBlonde]

Originally Posted by BBK

Sorry, meant for use with the stock wheels...

Out of that choice 245/35 but basically none of those tyres are worth shit for drag racing. Having said that, better than runflats!