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#1
13th September 2011, 03:24 PM
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Which size tyres for IVA
I'm a bit confused over what size tyre to fit. I'm using the sierra gearbox and speedo and I want to make sure that the speedo readings are within IVA spec.
The sierra original tyres were 185/65 R14 and I am looking at Toyo T1R's. The perfect match are 195/55 R15's at Approx £60 each whereas 195/50 15's are £36 each. Will the cheaper ones be ok. I assume that the speedo will read less than actual. Cheers Peter 
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#2
13th September 2011, 03:40 PM
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Gus's car went through IVA with 195/50/15 tyres, so go for the cheaper ones.
__________________
http://s831.photobucket.com/user/dav...ter%20Pictures OTR 01/05/14 - 1.6 CVH, Type 9, Bike Carbs, Megajolt
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#4
13th September 2011, 04:11 PM
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Hi Peter
As far as I know, 50 is the correct aspect ratio for a 15" Sierra wheel rim  This will ensure that the circumference of the wheel is correct for the Sierra's speedometer  I have a set of Toyo TR1's for my own build & they are 195/50/15
__________________
I am not a complete idiot...........Some of the parts are missing !! Ronnie www.roadster-builders.co.uk
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#5
13th September 2011, 04:55 PM
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Cheers Ronnie,
I used this website for comparison. http://www.etyres.co.uk/tyre-size-calculator.htm I was sure that a lot of people were using the 50 profile ok. Peter
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#6
13th September 2011, 05:57 PM
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Hi Peter
I use this site for reference. Alloywheels.com That said, I notice in the Haynes manual that both 195/65/14 & 195/60/14 were fitted to various Sierra models as standard. 195/60/14 had a V rating Hope I am not confusing the issue too much  Perhaps the tyres speed rating has a bearing on the aspect ratio of the tyre ?
__________________
I am not a complete idiot...........Some of the parts are missing !! Ronnie www.roadster-builders.co.uk Last edited by Bonzo : 13th September 2011 at 06:07 PM.
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