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Thread: Tyre size question

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    Tyre size question

    Will a 205/55/16 (7.5JxH2, ET40) fit to the standart suspension without spacers?

    I mean especially to the front side

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    Guest 200sxs13's Avatar
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    cant see why it shouldnt

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    Probably because the rim is wider than standart(6J), and the tyres are 17mm bigger in diameter than standart one(195/60/15)..I don't know

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    Flamethrower Pablo13's Avatar
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    Loads of room, Go bigger
    bstmeetbllk

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    cheers

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    Banned Vova's Avatar
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    Actually, it wont. I have a 7J ET40 rim as well and I tried a 205/55/16 on the front and it hit the spring-dish . They fit the rear though.

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    Flamethrower Pablo13's Avatar
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    Ahh I was thinking width ways myself. No bother then just go for a 50 profile
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    Oh, dear....thanks

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    Guest Rochester's Avatar
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    205/55 is fine, your problem isn't the profile, Pablo is I am afraid talking nonsense. Your problem is the hugely gay offset. 40 mm offset on a 7.5 inch rim would be almost hitting the strut and spring even with standard 195 tyres. You need at least a 5 if not 8 to 10 mm spacer (and longer studs) to move the wheel out.
    Last edited by Rochester; 20-04-2008 at 08:18.

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    I understand. So, I need to find a rim with ET 35 at least, or?

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    Banned Vova's Avatar
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    Not really, just get a 205/50 or 205/45..or 215/40 , it all fits fine without the need of spacers.

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    Flamethrower Pablo13's Avatar
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    Quote Originally Posted by Rochester View Post
    205/55 is fine, your problem isn't the profile, Pablo is I am afraid talking nonsense. Your problem is the hugely gay offset. 40 mm offset on a 7.5 inch rim would be almost hitting the strut and spring even with standard 195 tyres. You need at least a 5 if not 8 to 10 mm spacer (and longer studs) to move the wheel out.
    Thats strange, by my calculations a 7.5 inch et40 rim will extend 15mm less on the inside than what I have on my car which is a 9.5 et30, and when I had standard struts on my car I only needed a 6mm spacer to clear the strut

    Have a look yourself: http://www.1010tires.com/WheelOffsetCalculator.asp

    Agree with gay offset comment though
    bstmeetbllk

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    Guest Rochester's Avatar
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    I was just being too lazy to get up out of my seat and go look at my own wheels and check the offset, and relied on Vova's assertion that

    I have a 7J ET40 rim as well and I tried a 205/55/16 on the front and it hit the spring-dish

    I should have known better. Vova strikes again.... always to be relied upon as ever. Not. Sigh.

    So I have pulled my arse out of the armchair, made the effort to amble over and have a shufti at the real world.

    And on double checking the real world it happens I am quite cheerfully running 205/55 x 16's on the front of my S13 with a 7.5" rim width, et 35 offset (16" x 7.5 BK 82's). Perfect fit and no rubbing / arch / clearance in or out issues. The inner sidewalls of the tyres miss the strut, spring and spring seats by a good 3 or 4 millimetres all over.

    And, for the anally retentive amongst us, it follows that my 7.5" x et 35's are, amazingly, 1.25 mm closer to the strut and spring seat than Vova's anecdotal 7" x et 40's. And yet mine still don't touch. Amazing that. Shurely shome mistake there.

    PS. I don't follow your maths Pablo, 9.5 x et 30 + 6mm spacer = effective 9.5 x et 24 overall for the strut clearance; contrast that with a 7.5 x et 40 would move the wheel rim in 16 mm by way of greater offset 40 - 24 = 16), less 25 mm out for the narrower rim (9.5 - 7.5 = 2" / 50 mm narrower overall, divided equally either side of the wheel midline = inner sidewall 25 mm out / further away from strut) = nett difference of 25 out - 16 in = + 9 mm further out / away from the strut etc., not + 15 mm. ? or is my maths as poor as my energy levels and I've missed something ?

    Add 5 mm to my present et 35 for 7.5 x et 40 and they would definitely be rubbing on the strut...
    Last edited by Rochester; 20-04-2008 at 12:18.

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    Flamethrower Pablo13's Avatar
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    But you dont divide it equally either side, unless the offset is zero. But yes with the spacer added it does equal 9mm closer to the strut with my wheels than the et40 7.5.
    Last edited by Pablo13; 20-04-2008 at 12:22.
    bstmeetbllk

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    Banned Vova's Avatar
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    You are right Rochest, I obiously just made that up to give people the impression I'm all-knowing. I havn't tried it in practise nor made the calculatory analysis. In fact, I don't even have a car, let alone a drivers license!

    So go ahead, buy 205/55/16's on 7JET40. ...Just save the receipt.

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    Guest Rochester's Avatar
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    PS. Reduction in profile only makes a difference in sidewall height, not width, apart from the very slight millimetre or two difference in 'ballooning' effect under air pressure. a 205 is a 205 is a 205... regardless of profile and therefore sidewall height. So if a 205/55 rubs a 205/50 is going to rub too I'd have thought - a 10.25 mm reduction in radius has nothing much to do with the width....
    Last edited by Rochester; 20-04-2008 at 12:56.

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    Guest Rochester's Avatar
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    I have no idea where you get most of what you post Vova, all I have to do to know you are wrong is walk outside and look at my wheels in the real world, quite cheerfully fitting and working and not rubbing + two minutes simple maths.

    Oh, and two minutes with the search engine reading your other similarly 'informed' and 'helpful' posts...

  18. #18
    Banned Vova's Avatar
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    Its not the width thats the problem, its the height. The stock wheel sits just under the spring-dish, go ahead, look for yourself if you have stock wheels/susp. Now you are adding 15mm of height..guess what, it hits the dish.

    195/60/15 (stock) - Overall Diameter: 24.21 in 614.93 mm


    205/55/16 - Overall Diameter: 24.87 in 631.69 mm

    /Edit:

    Oops, I made a mistake, its radius that you need to count as the diameter works 2 ways, so you are adding 7,5mm.

    I once tried fitting cheap tires on the front and all there was left were some 205/55/16's from a Merc in the shop. So I put them on and it fitted but the spring-dish was sitting right on top it, maybe 1-2mm of space, I tried pushing the car and it didn't push downwards, it hit the tire.

    I have 205/55/16's on the back I'll mount them to the front and make a picture for you. If I win, you will write in your signature : Vova is right and I'm not. If you win, I'll do the opposite, deal?
    Last edited by Vova; 20-04-2008 at 12:39.

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    FYI i ran 215/45/17s on a 7j with 5mm spacers and et50 and they didn't hit the shock or spring seat

  20. #20
    Guest Rochester's Avatar
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    Quote Originally Posted by pablo13 View Post
    But you dont divide it equally either side, unless the offset is zero. But yes with the spacer added it does equal 9mm closer to the strut with my wheels than the et40 7.5.
    Why don't you divide differences in rim width equally ? Obviously after taking into account any difference in offset...

    The inset / offset is the measurement of the position of the centre line of the rim from the centre line of the hub. So the wheel centre line of an et 40 rim is 5 mm closer to the body of the car than an et35; et 25 is 10 mm further out and away from the body towards the arch lip, hence lower numbers are less gay ! Until you overdo it and hit the arch lip that is...

    The width of the rim is then (obviously) equally divided either side of the centre line.... that's why its called a centre line So once you've calculated any difference in offset, wheel centre line in / out, then why don't you divide differences in wheel rim width equally either side of that repositioned centre line for comparison purposes ? Lost me there if you don't....
    Last edited by Rochester; 20-04-2008 at 12:52.

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