Zektic Posted August 10, 2017 Share Posted August 10, 2017 Hey. Basically my Ford Fiesta 2013 came with 15 inch Steel wheels and I just bought 17 inch alloys to replace them with. However I don't know what size of tyres I will need to meet the same diameter or how changing them will affect my car. Yes I am an idiotic impulse buyer but could anyone help me out? I have an image of my current wheel size on my 15 inch wheels. Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 Depends what width the new alloys you've bought are. The Mk7 Fiesta normally runs 17" wheels on 205/40/R17, but that's with the OEM 17 x 7 wheels. Ideally you'll need to get the car re-programmed so it can adjust the speedo, ABS, etc for the new rolling circumference. You can use online tools to see how far out it will be otherwise. Also don't forget to tell your insurance company. Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 10, 2017 Author Share Posted August 10, 2017 The alloys are OEM I didn't want aftermarket alloys. So how would I go about calculating what size tyres I need based on the size of my alloys? sorry if this is all very annoying but I want to learn and appreciate your help. Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 As they are OEM, then I'd stick with 205/40/R17 tyres. Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 10, 2017 Author Share Posted August 10, 2017 Thank you! Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 Just remember if you don't get the car re-programmed your speedo will be 3.47% out. (http://www.tyresave.co.uk/tyre-size-calculator/) Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 10, 2017 Author Share Posted August 10, 2017 Who would you suggest to re-program it? Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 Any Ford dealer can do it, make sure they don't try and quote you more than half an hours rate though. It might be possible for a local garage to do it, just depends if they have the right equipment. Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 10, 2017 Author Share Posted August 10, 2017 if I go to my Local Evans Halshaw or Arnold Clark will they fit the tyres onto the alloys for me and fit them aswell as re-program it? Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 Yeah should do, they might want a kidney for it though, lol. Just get a fixed price from them first and query if it's any more than 1-2hrs work. Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 10, 2017 Author Share Posted August 10, 2017 Forgive me if this is taboo but could halford do it as they sell the tyres and fit alloys aswell as wheel alignment and all that jazz? Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 10, 2017 Share Posted August 10, 2017 You'd have to ask them if they have the equipment to re-calibrate the tyre size for the speedo to be correct. It's the same as a local garage in that respect. Quote Link to comment Share on other sites More sharing options...
Bobr Posted August 10, 2017 Share Posted August 10, 2017 Halfords? You said a naughty word. 2 Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 11, 2017 Author Share Posted August 11, 2017 Forgive me! 😂 Quote Link to comment Share on other sites More sharing options...
Wiggy! Posted August 13, 2017 Share Posted August 13, 2017 On 10/08/2017 at 4:28 PM, Zektic said: The alloys are OEM I didn't want aftermarket Alloys. So how would I go about calculating what size tyres I need based on the size of my alloys? sorry if this is all very annoying but I want to learn and appreciate your help. 205/40s are correct, will give the right overall circumference. These were available as a factory upgrade, interestingly the aftermarket upgrade makes note of steering rack limiter, nothing of any re-calibration though. Quote Link to comment Share on other sites More sharing options...
Zektic Posted August 13, 2017 Author Share Posted August 13, 2017 @Wiggy! Steering rack limiter what does that mean? Nice fiesta btw 😉 Quote Link to comment Share on other sites More sharing options...
jbell Posted August 13, 2017 Share Posted August 13, 2017 26 minutes ago, Zektic said: @Wiggy! Steering rack limiter what does that mean? Nice fiesta btw 😉 Correct, steering rack limiter should be fitted with 17's. Essentially means your full lock isn't quite as far round as with smaller wheels. Quote Link to comment Share on other sites More sharing options...
alexp999 Posted August 13, 2017 Share Posted August 13, 2017 It's intended to prevent the inside of the tyre running on the arch liner. Quote Link to comment Share on other sites More sharing options...
Luke4efc Posted August 13, 2017 Share Posted August 13, 2017 They were about £15 as far as I can remember, should be a 5 minute job to fit, just a case of pulling back rubber boot and clipping them on. Most people don't bother. I have upgraded to 17s and haven't used limiters, no problems with clearancr. I think they are for when you have heavy loads so the car sits lower, therefore closer to the wheel where it can rub. Quote Link to comment Share on other sites More sharing options...
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