AnswerID: 221624 Submitted: Wednesday, Feb 14, 2007 at 11:35
With the GX standard tyres 225/70-17, I believe that the speedo is not reading the correct speed. With the 225's when the speedo reads 100ks, I think the actual speed being travelled is around 97k's.
If I put on the standard GXL tyres, the 265/65-17's then I think the speedo would be correct. The 225's (using the tyre calc link provided above) are 747mm dia and the std GXL tyres are 776mm dia. The 245/70-17 are 774mm by the calculator but the Cooper tyre guide says the ST abd STT's are 780mm dia.
I want to put a decent off road tyre but they won't fit on the GX rims, so instead of getting expensive GXL rims, an option is to get the King rims (8 by 17 inch). I don't think the GX would need guard flares if I fit the 245/70-17 tyres on the 8 by 17 rims but I would need flares if I went with the 265/70-17.
The 245/70-17 and almost the same diameter as the standard GXL tyres. So the speedo should read the actual speed being travelled and fingers crossed I wont need to fit flares. If I'm wrong then Flexi Fares should be fine.
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