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Thread: tyres on awd?

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    Question tyres on awd?

    ive had 225 on the back and 215 on the front is this ok on the awd?

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    i would say on any 4wd this would be a no,no. having experience with suburu ect tyre wear cant be at different levels plays havoc with the diff trying to put the power down,dont think a volvo should be any different

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    Quote Originally Posted by Mental Wealth Doctor View Post
    ive had 225 on the back and 215 on the front is this ok on the awd?
    i think 3mm difference is the most your meant to have between tyres on a AWD. Just ran some figures thru a tyre calculator & 215/50/17 has a diameter of 25.5", while 225/50/17 has a diameter of 25.9". Making a difference of 0.4", which is 10.16mm

    so i wouldn't risk it tbh

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    What he said. Definately have to be the same, even Volvo bulletins say it.
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

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    a 19t just isn't laggy enough
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    Quote Originally Posted by bomb192uk View Post
    What he said. Definately have to be the same, even Volvo bulletins say it.
    was i right about the 3mm, couldn't remember if i'd read that about Volvo's or the old VX Calibra's

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    cheers boys anyone wanna buy some brand new khumo 225 40 17 doh
    i feel like a proper tit doh! titans i bought came with 225 on the back so i fitted and have kinda got used to the extra grip and wider look. so just went to replace them then thought after placing the order about me 4wd, what a muppet!

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    Quote Originally Posted by p fandango View Post
    was i right about the 3mm, couldn't remember if i'd read that about Volvo's or the old VX Calibra's
    Just had a quick look at the info I've got, but can't find any figures, it just says they must be the same size, but I've seen figures of 3-4mm before.
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

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    If I remember correctly about the Vauxhall 4x4 system, it was even tighter, something like 1-2mm difference, they didn't even like having the spare on, it was that bad!




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    The easiest thing to do is if you want to run a wider tyre on the rear is to come down an aspect ratio. For instance, I run 195/65/15 on the front of my Laguna and 205/55/15 on the rear, the lower aspect ratio of the rear tyres keeps the rolling radius the same.

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    Quote Originally Posted by nobananas View Post
    The easiest thing to do is if you want to run a wider tyre on the rear is to come down an aspect ratio. For instance, I run 195/65/15 on the front of my Laguna and 205/55/15 on the rear, the lower aspect ratio of the rear tyres keeps the rolling radius the same.
    sorry to pick fault, but that doesn't work out. I entered your example & the 195/65/15 has a diameter of 25" & 205/55/15 has a diameter of 23.9", giving a difference of 1.1". 205/60/15 is the closest but even then there is a 0.3" difference

    have a play with this LINK & see what you can get, but tbh getting different tyres within 3-4mm of each is going to be tough

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    4x Hankook Ventus V12 Evo K110

    215/45 R17 Y (91) ordered.
    so fingers crossed ive not hammered my diff, tyres have been on for over a month. gotta say this is possibly the stupidest misstake ive made thus far. the 4wd is still working ok no lights up. will it be ok? with some new even rubber. hate the thought of hurting my most dear motor

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    if youve damaged it you would know i think,,,really depends on your driving of late since the tyre change ect,,if shes being drove within an inch of her life then most likley wear that would lead to damage at some point,,tho easy driving i wouldnt be to concerned imo

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    well there's been a bit of both, gentle foreplay and a bit of good old smash it to her. fingers crossed she seems ok, and aint walking wonky. lol

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    AWD system is pure mechanics on the 850's matey, there won't be any lights if it fails, just some nasty noises (like when mine went hehe).
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

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    i use to run 33x 12.50x15" on my trooper lol oh and they were proper MT`s never screwed my diffs up, my mate ran 2 different size tyres on his scooby for 5 years and never had a issue


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    Quote Originally Posted by T5ER View Post
    i use to run 33x 12.50x15" on my trooper lol oh and they were proper MT`s never screwed my diffs up, my mate ran 2 different size tyres on his scooby for 5 years and never had a issue
    both those cars are dedicated 4x4's, not converted FWD's & run alot more advanced & complex systems than the Volvo's. Even the owners manual for the S60R still says to use the same size & make tyres all round

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    Tire Size Comparison

    Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
    215/45-17 3.8in 12.3in 24.6in 77.3in 819 0.0%
    225/45-17 4.0in 12.5in 25.0in 78.5in 808 1.4%


    Tire Size Comparison

    Specification Sidewall Radius Diameter Circumference Revs/km Difference
    215/45-17 97mm 313mm 625mm 1964mm 509 0.0%
    225/45-17 101mm 317mm 634mm 1993mm 502 1.4%
    will p1 v70r AWD diff fit my 850 AWD ?
    Last edited by Mental Wealth Doctor; Wednesday 16th December 2009 at 00:00. Reason: will p1 v70r AWD diff fit my 850 AWD

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    Quote Originally Posted by p fandango View Post
    sorry to pick fault, but that doesn't work out. I entered your example & the 195/65/15 has a diameter of 25" & 205/55/15 has a diameter of 23.9", giving a difference of 1.1". 205/60/15 is the closest but even then there is a 0.3" difference

    have a play with this LINK & see what you can get, but tbh getting different tyres within 3-4mm of each is going to be tough
    Admittedly the way I did it was to simply grab new tyres out of the stores and try them side by side until I found some that were close enough but you are right what you say that 205/60/15 is closer because I checked today and that is actually what I have got on the front not 65 section, my bad, apologies !

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    Quote Originally Posted by Mental Wealth Doctor View Post
    will p1 v70r AWD diff fit my 850 AWD ?
    Which diff? Rear or front angle gear?
    1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
    1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
    2004 Sapphire Black S60 D5 - The new daily hack.

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    rear diff mate


 

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