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![]() | Home > Wheels & Tyres > Spare Wheel 50Mph 19" |
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RRSTDV8 Member Since: 12 Aug 2011 Location: Northamptonshire Posts: 9025 ![]() ![]() ![]() |
I think it's the tyre that limits the speed, not the wheel. Space saver spares are much narrower than the standard tyre so they carry a higher specific loading. Because they're narrower they effectively run a much deeper sidewall so one get's greater tyre flex at speed. They also use a different rubber compound so that they closely match the full size's grip characteristics. Running different tyres on an axle is generally considered to be "a bad thing" so using a much smaller tyre with different characteristics is definitely "a bad thing". Running said tyre at high speed is, well, you get the picture.
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Marsie Member Since: 20 Jul 2011 Location: sheffield Posts: 376 ![]() ![]() ![]() |
I also wondered why this was. I have a 19" spare (D3 HSE wheel in black) with a brand new pirelli scorpion zero on it, and although it is slightly smaller than the 275/40/20s on the car it isnt by much |
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flydive Member Since: 16 May 2007 Location: South Posts: 1213 ![]() ![]() ![]() |
There is really no reason why it is limited.
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muddywheels Milk Float Man Member Since: 30 Jun 2010 Location: East Riding of Yorkshire Posts: 5637 ![]() ![]() |
The problem is if it doesn't match the rest of the wheels on the vehicle it will affect braking and handling so speed is restricted |
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RRSTDV8 Member Since: 12 Aug 2011 Location: Northamptonshire Posts: 9025 ![]() ![]() ![]() |
If it's a standard 19 inch wheel with a 255/50 tyre fitted then it's less of an issue than if it's a proper space saver spare. But running a 255/50 on one corner whilst running 275/40 on the others is always going to give you interesting dynamic issues especially under braking. 2012 SDV6 - it's missing a couple of cylinders
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Cobalt Member Since: 29 Jun 2010 Location: Exeter Posts: 14 ![]() ![]() ![]() |
So instead on doing 100 I will do 70 not 50 Kms of course ! |
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muddywheels Milk Float Man Member Since: 30 Jun 2010 Location: East Riding of Yorkshire Posts: 5637 ![]() ![]() |
I guess you can do whatever speed you feel safe doing in the conditions at the time but in the event of an accident first thing investigator will check is speed rating on wheels and if you exceeded it things could get difficult for you with Police and insurance |
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