which tyre size?

[caprilaser]

Hi, I've got some 13" cobra slotmag wheels that are 8" wide, I dont know too much about tyre sizes but I think I need 13 205 60 size tyres. Does this sound right and can anyone recommend any decent tyre companies that sell this size tyre at a reasonable cost? Kwik fit quoted £100 per tyre!! Cheers!

[Fiesta Steve]

Hero

Summer tyres HR-668

205/60 R13 87H With mytyres.co.uk only £ 26.60

 

Federal

Summer tyres SS-595

205/60 R13 87H With mytyres.co.uk only £ 30.10

 

TOP*

Summer tyres top quality

205/60 R13 86H BSW, CN With mytyres.co.uk only £ 30.20

 

Nankang

Summer tyres XR611

205/60 R13 86H BSW, CN With mytyres.co.uk only £ 30.60

 

Asian manufacturer using innovative high performance technology

GT Radial

Summer tyres CHAMPIRO 60

205/60 R13 86H With mytyres.co.uk only £ 35.80

 

Maxxis

Summer tyres MA V1

205/60 R13 86H With mytyres.co.uk only £ 35.90

 

Falken

Summer tyres ZE-502

205/60 R13 87H With mytyres.co.uk only £ 41.10

 

Ultra High Performance Tyres

Toyo

Summer tyres ROADPRO R 610

205/60 R13 86H With mytyres.co.uk only £ 45.10

 

 

Prices includes postage, packing and VAT within mainland UK.

 

 

 

I've used 'mytyres' before with no problems

[Guest cortinamad-gonetoo]

just shop around kwik fit can be a bit of a rip off ive found out

 

you could maybe go a bit wider than 205 on a 8" rim

[Rick]

those prices sound cheap,

 

whered you find that info out

[Fiesta Steve]

www.mytyres.co.uk

[Rick]

cheers

[caprilaser]

cheers, those prices seem really good value!! Would you say 205 is the right size for 8 inch wide wheels or is it better to go a bit wider?? I dont think I'm going to have too much room on the rear for clearance.

[caprixpack]

i can vouch for the falkens i ran them on my xr2

 

were great tyres

[Vista]

No, 205 tyres aren't wide enough for an 8J rim. Here's a shot of what's happened to two sets of jeni8759's tyres when she tried to run 205/50/13's on 8J rims

 

 

The problem is that the tyres are too narrow (or the wheels are too wide) and are stressing the sidewalls to the point where they fail

 

Here's a useful website link for tyre size research

 

http://www.carbibles.com/tyre_bible.html

 

About 3/4 of the way down is a rim size calculator for a given tyre size, 205/60/13's are suitable for between 5.5 and 7J rims. for 8J rims you need wider rubber

[Von Loxlee]

 

 

what profile where they? i have 205s on mine (i havent driven on them yet) and there hardly stretched at all!

[Rick]

damn....

[Vista]

They were 50 profile, but the site link I posted above states that 205/60's shouldn't be used on wider than a 7J rim

 

P.S. It's happened more than once to her, she replaced the first pair as she thought it was a puncture or one of. The same thing happened on the second pair though.

[caprilaser]

ok so am I best going for a 235 width then?? And is 60 the right aspect ratio?? I really have no idea when it comes to tyres. They are going on a cologne MK1 capri with a 3 litre rear axle if that makes any difference and the wheels are pretty deep dish cobra slotmags.

[Vista]

No, 60 will probably be too tall a side wall for a 235 width tyre.

 

The figure 60 is the tyre side wall height as a percentage of its width, a 235 / 60 will therefore have a taller side wall than a 205 / 60.

 

If you're using 235, I'd go for 235 / 50 / 13. The problem is however that really wide rubber isn't that easy to come by for 13" wheels anymore so there may not be such a size as 235 / 50 /13 available. You'll need to do a little research by phoning around or searching online tyre suppliers

[Von Loxlee]

i looked for ages for tyres that size but the only kind anyone could offer were road legal slicks which were over £100 for each corner:(

[caprilaser]

I've had a look around, would these be suitable? They are track tyres but should be road legal and how long would they last under normal driving? http://www.camskill.co.uk/products.php? ... 0s686p1841 they are pretty expensive though!!! Cheers for the info.

[Vista]

I reckon they'd be good enough, but I'd be very careful in the wet with them.

 

My advice? ring up Gupa - P tyres in Plymouth and ask to speak to Dave, he's a member on here (d13dkt) and has done a few people good deals on tyres. They also stock kumhos. Tell him you're from OSF and explain your problem I'm sure he'll be able to help. I don't have their number but it'll be available online somewhere

 

 

P.S. have you looked into how your tyre selection will affect your speedo reading yet? for instance if your car originally ran on 205/60/13's and your speedo is geared an calibrated for them, using 235/45/13's it'll now read around 5mph out, you'll be doing about 65 when your speedo reads 70

[caprilaser]

Cheers I'll give them a ring and see if I have any luck. As to the speedo difference I was going to borrow my mates Tom Tom to check how accurate it is as I dont trust the readings it was giving before. The cars not on the road yet (its the one on my avatar pic). Thanks for your advice.

[Vista]

what car is it and what's the original wheel and tyre size from new?

[caprilaser]

its a mk1 capri 1600gt but not much of it is standard, the wheels it had on when I got it were sierra cosworth I think, they looked rubbish as the offset was all wrong. Im not sure what size the original wheel/tyres are supposed to be unfortunalty. I guess they would be similar to the later capris??

[RETRO_AL]

ive used 205 on a 8inch rim before with no probs,look how many run 175 on 7inch rims!

im now running 245 on 10inch wide rims with no probs

i would say a 225 would be a better option for 8 inch tho

[Fiesta Steve]

Loads and loads of people are using 175 tyres on 7" rims, and they fit fine and have never heard of anyone having problems.

 

So, logic tells me if I have a 1" wider wheel (8") then a 1" wider tyre will be fine.

 

1" is approx 25mm so 175+25= 200. So surely 205 is plenty wide enough ??

 

 

Although the numbers on the side wall are meaningless as soon as you get a tape measure out.

[Vista]

Logic isn't always straight forward though.

 

By my calculations for a 175/50 you should use a rim size between 5 and 6.5J stretching it out to 7 is probably ok but go to 7.5 and I'd say you'd be taking risks. Though if you reduce the profile to a 45 series then it'll fit up to a 7.5J rim safely. The same can be said of 205 tyres if you use 45 profile or lower then they can be safely fitted to a rim of between 7 and 8.5J but use 50 profile or higher and that changes to 5.5 to 7J, this is because of the 70% / 85% rule explained below

 

 

Aspect Ratio and Rim / Pan Width.

 

Aspect ratio is the ratio of the tyre's section height to its section width. The aspect ratio is sometimes referred to as the tyre 'series'. So a 50-series tyre means one with an aspect ratio of 50%. The maths is pretty simple and the resulting figure is stamped on all tyres as part of the sizing information:

 

Aspect ratio = Section height divided by Section width

 

The actual dimensions of a tyre are dependent on the rim on which it is mounted. The dimension that changes the most is the tyre's section width; a change of about 0.2" for every 0.5" change in rim width.

 

The ratio between the section width and the rim width is pretty important. If the rim width is too narrow, you pinch the tyre in and cause it to balloon more in cross-section. If the rim width is too wide, you run the risk of the tyre ripping away at high speed.

 

For 50-series tyres and above, the rim width is 70% of the tyre's section width, rounded off to the nearest 0.5.

 

For example, a P255/50R16 tyre, has a design section width of 10.04" (255mm = 10.04inces). 70% of 10.04" is 7.028", which rounded to the nearest half inch, is 7". Ideally then, a 255/50R16 tyres should be mounted on a 7x16 rim.

 

For 45-series tyres and below, the rim width is 85% of the tyre's section width, rounded off to the nearest 0.5.

 

For example, a P255/45R17 tyre, still has a design section width of 10.04" (255mm = 10.04inces). But 85% of 10.04" is 8.534", which rounded to the nearest half inch, is 8.5". Ideally then, a 255/45R17 tyre should be mounted on an 8½x17 rim.

[jeni8759]

No, 205 tyres aren't wide enough for an 8J rim. Here's a shot of what's happened to two sets of jeni8759's tyres when she tried to run 205/50/13's on 8J rims

 

 

The problem is that the tyres are too narrow (or the wheels are too wide) and are stressing the sidewalls to the point where they fail

 

Here's a useful website link for tyre size research

 

http://www.carbibles.com/tyre_bible.html

 

About 3/4 of the way down is a rim size calculator for a given tyre size, 205/60/13's are suitable for between 5.5 and 7J rims. for 8J rims you need wider rubber

 

 

Iv just done that calculator and 230 50 13's would fit my rims?

 

Having troubles with the guy i got my tyres off before he doesnt beleive my tyres are wrong and refuses to do anything about it

 

Does anyone know if i can really kick up a fuss with this to get him to refund or sort out the right ones? Or can he refuse to?

 

I was also told if i had had an accident and needed to claim, my insurance would have been void if the car was inspected and the wrong size tyre was on the car... So i really need to get them sorted out asap

[Fiesta Steve]

So a 205 is fine on an 8" rim depending on the profile. ?