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Tyre size for classic

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Old 30 November 2013, 06:40 PM
  #31  
P555SBR
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I run 225/45/17 on my classic with no rubbing what so ever on standard suspension
Old 01 December 2013, 12:12 AM
  #32  
ace1981
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I'm on 205/45/17 on my classic's Prodrives - find them a little crashy over rutted roads, otherwise smooth as you like.

Seen a couple of the same alloys on eBay with 225/40s on, though - as per my previous thread. Planning to get the 225s off and my 205s on.
Old 01 December 2013, 02:30 PM
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alcazar
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Originally Posted by P555SBR
I run 225/45/17 on my classic with no rubbing what so ever on standard suspension
You are doing well then, both the aspect ratio AND the size is wrong.
your speedo will be well out.
Old 01 December 2013, 05:59 PM
  #34  
winston69
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Originally Posted by riiidaa
225 eh, not a classic then?

https://www.scoobynet.com/tire_rim_calculator.php

put the 215/40/17 in the current tyre section then what you wish / have already got on underneath.

but if you're running a newage, refer to owners handbook regarding tyre profile originally supplied, this thread is about classic
Yes mine is a classic


So does that mean my speedo reads fast or slower?

Last edited by winston69; 01 December 2013 at 06:05 PM.
Old 01 December 2013, 08:58 PM
  #35  
alcazar
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If they are nearly 5% bigger, it will be reading slow. (Covers MORE distance for the given gear ratio.)
Smaller means it reads fast.

Incidentally, a difference in diameter of 1.2" is +3 & 3/4" in rolling circumference.....
Old 01 December 2013, 11:04 PM
  #36  
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So at 50mph it will be 2.5mph out? Not that bad really?
Old 02 December 2013, 01:50 AM
  #37  
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Originally Posted by winston69
So at 50mph it will be 2.5mph out? Not that bad really?
Errm yes it is, the law states you can under read but not over read (or is it the other way round ), your bigger circumference and that 2.5% means your speedo is slower than the actual speed, ie its saying 30 and you are doing 33mph, thats illegal, its ok the other way round though within 10%
Old 02 December 2013, 10:44 AM
  #38  
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Exactly.
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