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Discussion Starter #1
im runnin 205/40/17 on mine and my car is pretty damn low, a 45 series will work fine especially if you are still running a stock suspension.
 

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Still on stock suspension.... planning on getting sports suspension at some stage, but not dropping it much at all (2-3cm at MOST).

Pretty sure it should be fine on 45's, but I was thinking about going for 50's or will that really throw things off balance??
 

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not sure how much that will effect the speedo.... basic rule of thumb will be...
15's get 50 series tires...
16's get 45 series tires...
17's get 40 series and so on and so forth...
i would try to find some 45s just to be safe.... i have read that those gatso's are bastards!
 

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you could do the 45's and be safe since you're still on stock suspension.. you'd be fine too even when you did do a suspension.
 

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Currently have:
Toyo Proxes T1-S tyres 205/40ZR17 80W

Obviously on 17" rims... on my Mk3 convertible.

I've been avised that 205/45;s would be a more comfortable ride, but most manufacturers won't do 45's and I'd be quite keen to fit 205/50's if they're not goign to be too big for the arches, etc.

Still on stock suspension, etc (only jsut bought the car).

rgds,
LostBok
 

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Thanks guys.

My local dealer doesn't do Toyo's at 45mm profile, this is all I can get:

Kumho 712 205/45 R17 Z £81.85
Falken ZE512 205/45 R17 W £84.74
Bridgestone RE040 205/45 R17 W £119.43
Pirelli PO ASSIMETRIC REINFORCED 205/45 R17 W £127.86
Yokohama A539 205/45 R17 Z £130.73
Dunlop SP9000 205/45 R17 Z £136.46
Michelin PILOT SPORT 205/45 R17 W £151.80

Think I'm going for Dunlop SP9000's.

Shout now if any of the others look especially good!

Lostbok
 

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How difficult would it be to get the speedo re-calibrated?

how much should it under read the speed??

rough calcs:


40 profile = 884 revs per mile

45 profile = 855 revs per mile (approx)

50 profile = 826 revs per mile

If my can was doing 100mph on 40's, the same speed on the tacho would be actually be:
100 x 884/855 = 103.4mph

I'm pretty good with on-the-fly mental arithmatic, so should be okay... don;t speed by more than 5% and I should be okay


To be fair I'm pretty good with my "10+2"* maths for UK roads already, not that I usually push my luck even that much - just useful when there's somebody being and idiot and tailgating you when they can't overtake.

laters,
LB

* "10+2" is the police guide for speed trapping in the UK: 10% of stated speed limit + 2mph.

15mph = 18.5mph
20mph = 24mph
30mph = 35mph
40mph = 46mph
50mph = 57mph
60mph = 68mph
70mph = 79mph

Hence why everybody "mysteriously" cruises at just under 80mph on the motorways... perfectly safe speed for a modern car on good roads, provided you have a safe stopping distance.... only prob is there's always the fruit-cake who likes to tailgate at that speed too.... "only a fool breaks the two second rule" and all that....

[ March 11, 2004: Message edited by: LostBok ]
 

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I've been told by the tyre shop that 205/40's are the correct size for that car and changing that would affect ride height, speedo, etc.

Apparently it would be a lot better to stick with 40's.

How much would the 45 profile tyres affect ride height and handling, given the car is still on stock VW suspension and I'd rather not change that for a while yet.

LB

[ March 11, 2004: Message edited by: LostBok ]
 

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the ride height difference between 40s and 45s is so small you wont really notice...you already knew it would mess with your speedo reading.... the only real difference will be the gap from body to edge of tires. you will have slightly less of a gap due to the thicker wall on the tires.
but it will be all good when you drop the dub!
 

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Would the quality of the ride increase due to the higher aspect ratio of the side wall, i have 40 aspect ratio on mine and the ride is pretty rough
 

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the more side wall you have the more cushion there is for the bumps....wont make a huge difference just going to 45s but you'll notice it in the small bumps in the road.
 

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from the pic it looks as if your car is stock ride height or very close to it.... you should not have a problem... even if you lower it alittle
 

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only prob is that 205/45/17's aren't that common.... I'm going for 40's for my new Toyo Proxes... getting Koni/Eibach shox and springs, plus Eibach sway bars... with that I'll be able to lower the suspension a bit if needed and 205/45/17's won't be as much of a headache... just hte availability of them.

Was gonan go for the Dunlop SP9000's, but they're run-flat, so a harder ride anyway.....
 
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