DODG-E
Member
Registered: 24th Jan 03
Location: Romford, Essex
User status: Offline
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is there anyway to adjust this!!? its quite annoyin for cameras.
e.g 40 on the clock = 58!!
im getin 40 profiles cos they rub like a bitch.
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Dan
Premium Member
Registered: 22nd Apr 02
Location: Gorleston on Sea, Norfolk
User status: Offline
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do ya mean 48 
Adult GiftsClick here to vist us
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Red_SXi
Member
Registered: 23rd Sep 02
Location: Dunstable Drives: 52 Plate BMW 3 M Sport Coupe
User status: Offline
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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At 40mph, your clocks DONT read 48 with 16's. In fact at those speeds the increase is negligable. Its at 60+ where the rolling radius increases dramatically, and its not as if you have 18's either.
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Gambit
Member
Registered: 5th Jun 00
Location: Common Sense HQ
User status: Offline
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this will tell you how much your speedo is out
http://www.miata.net/garage/tirecalc.html
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Patrick
Member
Registered: 25th Apr 02
Location: SE London
User status: Offline
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Specification - Sidewall - Radius - Diameter - Circumference - Revs/Mile - Difference
185/65-14_____4.7in __11.7in___23.5in______73.7in______859____ 0.0%
195/40-16_____3.1in __11.1in___22.1in______69.6in______911____-5.7%
195/45-16_____3.5in __11.5in___22.9in______72.0in______880____-2.4%
195/45-15_____3.5in __11.0in___21.9in______68.8in______921____-6.6%
215/35-17_____3.0in __11.5in___22.9in______72.0in______880____-2.3%
Well I did these tyre sizes on that website you've just given and according to that out of all the tyre sizes above the original wheel has a greater rolling radius? How come? 
Think there calculations are wrong!
[Edited on 09-05-2003 by Patrick]
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Kris TD
Member
Registered: 25th Mar 02
Location: Ware, Hertfordshire
User status: Offline
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dont forget the speedo reads slow anyway, so you are actually doing the right speed .
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DODG-E
Member
Registered: 24th Jan 03
Location: Romford, Essex
User status: Offline
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but i sit next to ppl goin thru cameras... and my clock is bout 10mph under the speed of the camera....
its not really important... but thought i would say lol..
xhale2007: yeh u know wot i meant.
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Daimo B
Member
Registered: 20th Mar 00
User status: Offline
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D4 runs at the limiter in 4th on 195/45/16 @ 102mph and reads 98mph. This goes to pot after 100mph though
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Rocky
Member
Registered: 16th Nov 02
Location: Bridgend S.Wales Drives : Astra VXR
User status: Offline
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wats 205/40/17 then wat kind of difference just like to know as i hav sum new 17s going on!!! i know it will below if you going 30mph abt prop 28mph on 17s!!
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