Tyr size question
#1
PassionFord Post Troll
Thread Starter
Tyr size question
Hello all,
wondering if someone can help me out.
I've got a focus Chic special edition, currently on its stock alloy rims with standard 195/60/15 tyres.
However, I've just taken delivery of a set of 17 inch MP3 alloys, won off ebay. They are ok and just require a refurb, which i'm going to get done this weekend.
Now then the tyres fitted to the MP3 alloys are luckilly new, but they are 215/40/17.
will I be OK keeping the 215/40/17 tyres on, or should you strictly have 215/45/17 tyres on. The Focus St170 & MP3 have 215/45/17 tyres fitted as standard, not 215/40/17.
Am I getting my keks in a twist over nothing, will it be OK to stick with the 40 profile tyre, or should I get new tyres with the 45 ratio?
Thanks in advance
Andy
wondering if someone can help me out.
I've got a focus Chic special edition, currently on its stock alloy rims with standard 195/60/15 tyres.
However, I've just taken delivery of a set of 17 inch MP3 alloys, won off ebay. They are ok and just require a refurb, which i'm going to get done this weekend.
Now then the tyres fitted to the MP3 alloys are luckilly new, but they are 215/40/17.
will I be OK keeping the 215/40/17 tyres on, or should you strictly have 215/45/17 tyres on. The Focus St170 & MP3 have 215/45/17 tyres fitted as standard, not 215/40/17.
Am I getting my keks in a twist over nothing, will it be OK to stick with the 40 profile tyre, or should I get new tyres with the 45 ratio?
Thanks in advance
Andy
#2
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This tool is very useful, using your dimensions I came out with -1.7% and -1.8% error for the 45 and 40 profiles respectively. Essentially it makes little difference, both put your speedo out a small amount in the safe direction
http://www.kouki.co.uk/utilities/vis...ize-calculator
http://www.kouki.co.uk/utilities/vis...ize-calculator
#3
PassionFord Post Troll
Thread Starter
Thanks very much for putting my mind at rest
Looks like it was £195 well spent off of ebay after all!
Off down to a local alloy specialist friday morning that do complete refurbs from £30 per wheel. I dont mind spending up to £200 for the refurb, considering all the tyres are virtually brand new.
Cheers
Andy
Looks like it was £195 well spent off of ebay after all!
Off down to a local alloy specialist friday morning that do complete refurbs from £30 per wheel. I dont mind spending up to £200 for the refurb, considering all the tyres are virtually brand new.
Cheers
Andy
#4
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Actually, just checked again to make sure lol.
The 40 profile will mean when your speedo reads 30, you are doing 29.5
The 45 profile will mean when your speedo reads 30, you are doing 30.5
So in that sense, 40 seems better just wanted to clear that up.
The 40 profile will mean when your speedo reads 30, you are doing 29.5
The 45 profile will mean when your speedo reads 30, you are doing 30.5
So in that sense, 40 seems better just wanted to clear that up.
#5
An ace site I use is,
www.kabamus.com/garage/gears.html
With this just put in your tyre size and diff/box ratio and it does the rest, gives you speed in 1000rpm steps.
tabetha
www.kabamus.com/garage/gears.html
With this just put in your tyre size and diff/box ratio and it does the rest, gives you speed in 1000rpm steps.
tabetha
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