bigger wheels.... speedo?

1. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

   #1 22nd October 2006, 14:26

   alryt guys, quik question, iv bought sum 16's n i wondered if putting larger wheels on will affect the speedo, and if so by how much???
   
   cheers
2. Luke Saxperience Hardcore! Joined: Dec 2005 Bradford Posts: 26687 '15 Focus ST-2

   #2 22nd October 2006, 14:29

   Firstly, please don't use text talk. Takes twice as long to read it.
   
   If you are putting 16s on, it's more than likely to make it more accurate.
3. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #3 22nd October 2006, 14:31

   yup it'll be affected.
   
   But its a combination of alloy size AND height of the sidewall of the tyre.
   
   for instance 16's with a 35 profile would have a smaller rolling circumference than 15's on 45 profile. thus the speedo will be less accurate.
   
   the amount goes out by the combination of alloy and profile selected.
   as a general guide the saxo's are out by 6-10% (speedo reads higher than actual speed) as standard.
   
   the smaller the rolling circumference the less accurate the speedo is, but with 16's we're only talking a couple of % difference
   however 16's with a 45 profile make the speedo more accurate :Y:
   
   If you tell me the tyres you are running then i can tell you how much of a change to expect.
4. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

   #4 22nd October 2006, 14:34

   ok, cheers, aslong as it doesnt read less than the speed im doing i dont care.
5. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #5 22nd October 2006, 14:42

   woah!!!
   
   16's on a 1.1
   I hope you dont intend actually driving it with those on.. it'll scrubb to the max.
   you need like 4x4 tyres to get any where near the actual speed :Y:
   
   to be on the safe side grab a gps sat nav jobby and check the speed on that.
6. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

   #6 22nd October 2006, 15:00

   wil it scrub bad? damn. not paid for them yet anyway, they off my cousin, if they scrub bad he can av them bk. just good job i aint paid shit loads for them. what do u think then bout speedo, make a big diffrence? worth putting these wheels on?
7. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #7 22nd October 2006, 15:04

   Unless yours is a 5door there is going to be issues I believe.
   My best advice is to Pm 'snewham'
   he has a 1.1 and has 16's - he's your expert regarding this sort of thing.
   
   Back to the speedo
   it wont make a massive difference mate... maybe 4% change MAX
   
   
8. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

   #8 22nd October 2006, 15:07

   it is a five door, whats difference? il av a chat wi him, cheers for ur help
9. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

   #9 22nd October 2006, 15:14

   ok here's the crack dude...
   
   I've put 15's on my 5-door
   if you put 15's on a 3-door then there is some work needed to be done on the rear arch (how there is a difference I dont know!!! lol). So putting 16's on the 3-door is a proper ballache.
   
   I'm convinced there is enough space to fit bigger wheels on mine i.e. 16's
   There was a lad who had 16's on his 5-door too.
   
   Its worth mentioning that... it's not the size thats the problem its the width of the alloys and tyres. Just so you know
   
   you should be alright
   but i'd like to know what the outcome of this is so keep us posted mate
   
   ads
10. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

    #10 22nd October 2006, 15:20

    ok mate, thanx alot, bin a big help, il let u know how i get on, hope il be ok. cheers agen, iv given u some rep points!!!
    
    nick
11. GTI_Lee Established Member Joined: Jun 2006 Wales Posts: 1486 1)2002 Saxo VTR 2)2003 106 GTI

    #11 22nd October 2006, 19:49

    Quote:

    Originally Posted by adsayer woah!!! 16's on a 1.1 I hope you dont intend actually driving it with those on.. it'll scrubb to the max. you need like 4x4 tyres to get any where near the actual speed :Y: to be on the safe side grab a gps sat nav jobby and check the speed on that.

    
    It wont rub mate!
12. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #12 22nd October 2006, 20:14

    on a 3-door it'll rub.
13. GTI_Lee Established Member Joined: Jun 2006 Wales Posts: 1486 1)2002 Saxo VTR 2)2003 106 GTI

    #13 22nd October 2006, 20:26

    naa, it wont! not at all mate!
14. Barry123 Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS

    #14 22nd October 2006, 20:27

    check snewhams progress thread then...
    
    anyway we've established its a 5-door so it wont scrubb
15. Jonny1124cc Regular Poster Joined: Jan 2004 West Yorkshire Posts: 305 Silver Citroen Saxo

    #15 22nd October 2006, 20:33

    Im running 16s and when my speedo says 30mph my tom tom says 27mph so if you stick to the speed limits you will never be caught speeding!
16. stevenet15 Saxperience Forum Bum Joined: Jun 2006 aylesbury buckinghamshire Posts: 4822 Astra Turbo, saxo vts, punto turbo

    #16 22nd October 2006, 20:39

    ok go ot this site http://www.carbibles.com/tyre_bible.html then scroll down to A tyre size calculator.
    
    put in the stardard wheel and tyres size and then put the wheel and tyrs size u want to put on, it will then tell u how much ur speedo will be out
    
    here is a pic
    
    
17. nickevo3 Newbie Joined: Aug 2006 Chesterfield Posts: 25 saxo mk2 blue

    #17 24th October 2006, 11:58

    cheers pal, that sites a big help.