- Feedback
- View
so if you come across a Saab tractor doing 27mph, 36mph, 54 mph and 63mph its Orange71....
Low profile car tyres - pro's and con's??
- Thread starter orange71
- Start date
orange71":3ibpgu33 said:Ziggy":3ibpgu33 said:
what's 7j? sorry
why do I want to change? Just covering all options I guess - better economy? Better handling? Cheaper?
Width of the wheel (& shape of the lip, but ignore that!). They'll have something like 6.5J stamped on them somewhere...
orange71":3tnj24yl said:
The only way to get most of them covered would be to invest in a nice new shiny set of 18" (or so) alloys (preferbaly magnesium alloy as it's lighter and stronger) running a 225/40/18 tyre set-up.
Better handling for sure
Better acceleration for sure (less rotating mass)
better economy (debatable)
Oh and the best part of £1500, so then you have to start factoring in the amount of time/milage it will take for the payback on that outlay, for improved mpg.........
Or stick with the current set-up, and spend a few hundered quid on getting the ECU remapped, that will give you better economy too, and for about £300ish.
It'll also give you extra horsepower, more speed, and a bigger grin! :twisted: :twisted:
GT-Steve":2j7fhlvj said:
Only ~4% bigger, so the increased gearing might not slow you down all that much. Add the increased rolling resistance (worse economy) to the equation though, & you're not going to be going any faster than stock. & that's if you get a significant weight saving... The reason to fit massive wheels is because you can fit bigger brakes under them!
Bet it'd handle like a pig too, but hopefully he's got more sense than to try that out
Thought about getting a remap (I've seen them taking the standard 115bhp to 135bhp) - wonder what better economy I might get? Would it pay for itself? Would I also get that black soot around the bumper? (Not too much of a problem as the car's black anyway
)
- Feedback
- View
As someone that has worked on the technical side of the car tyre business for 25 years I can agree with most of what is said above. Basically, do not change size, fit some quality branded tyres and run them at the correct inflation pressures. Two months ago I changed the tyres on my car to a 'fuel saving' option and the average mpg has gone up but by only 1 mpg according to the computer.
Contrary to popular belief, grip isn't directly related to width of tyres.GT-Steve":2e8wvplu said:and if that's wider, then you can fit wider tyres and improve grip
Contact patch is related to tyre pressure and weight of the car.
Wider tyres don't necessarily (all other things being equal) increase the contact patch - the may change it's orientation, and by merit of different tyres and compounds used, increase grip - but that's not purely because they're wider.
Some are, true enough.GT-Steve":2e8wvplu said:plus they're generally lighter than steel wheels
But some cheapo alloys are no better, weight wise, than steel wheels.
At this level it's going to come down to aesthetics and what you personally like the look of.
Neil":220hqt3a said:
Crikey, so if I was to buy a high performance car, for example Aston Martin, Lamborghini, Ferrari, Bentley, R8, GTR, etc. etc. I could spec it with 15" steel wheels (provided they cover the brakes
) fitted with 195/50's instead of 275's+ and a 18/19 or even 20" rim, and with the correct weight distribution and tyre pressure expect exactly the same contact patch and thus - grip??? :?: :?: In all seriousness, I've actually learned something today, thankyou.
Neil said:But some cheapo alloys are no better, weight wise, than steel wheels.
quote]
Hence my earlier statement regarding magnesium alloy wheels (such as Dymag's)
Similar threads
