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PostPosted: Fri Jun 29, 2018 8:18 pm 
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Joined: Sun Apr 16, 2017 7:16 pm
Posts: 42
Car Model: Saab 900 Turbo 1980
My 1980 900 turbo is fitted with metric TRX wheels. I love the look of them, always have, and they are going to stay on the car as I can't imagine the car without them.

The car has just passed its MOT after 28 years sitting at the back of a barn on bricks.
The 180/65 HR 390 tyres were virtually brand new when it was parked up back in 1989 but at 28 years old I am really concerned about their safety. I'm pretty certain they wont last long that's for sure.

Sadly I can't get a direct replacement set as that particular size would seem to be completely unavailable.
I've found a web site that recommends the following as alternatives and Longstone tyres seem to have them
200/60 HR 390
210/55 VR 390
220/45 VR 390

I'm not sure of what HR and VR mean.
Has anyone got any experience of which one would be best.
My take on it is that in terms of profile and width the closest alternative would be 200/60 HR 390 (helpfully the cheapest of what are eye watering expensive tyres


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PostPosted: Fri Jun 29, 2018 8:39 pm 
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Joined: Mon Aug 22, 2016 11:23 am
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Location: Leicestershire
Car Model: 1992 3dr 900i
https://www.tyrespeedrating.co.uk
28 years is certainly a long time! Well done on the MOT though.


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PostPosted: Fri Jun 29, 2018 9:06 pm 
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Joined: Wed May 12, 2004 9:46 pm
Posts: 14452
Location: Mulbarton,Norfolk
Car Model: TTid's only now :-(
190/65*390 ??

https://www.longstonetyres.co.uk/190-65 ... n-trx.html

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PostPosted: Sat Jun 30, 2018 10:17 am 
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Joined: Tue Oct 30, 2007 9:26 pm
Posts: 5966
Location: North Essex
Car Model: 900Ruby,vert, 9000, 99, Sonett
JonBentley wrote:
...

I'm not sure of what HR and VR mean...



H is max speed 130MPH
V is max speed 150MPH

Longstones are experts in all sorts of tyres for older cars. We got tyres for the Austin Seven from them. (135X19) Give them a ring they're very helpful.

01302 714072

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PostPosted: Sat Jun 30, 2018 1:02 pm 
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Joined: Sun Apr 16, 2017 7:16 pm
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Car Model: Saab 900 Turbo 1980
Thanks for all your help with this. Didn't realise there was the option of 190/65 HR 390. Thats a much closer match to the originals and marginally cheaper so that's welcome.
The search shall begin !!


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PostPosted: Fri Jul 06, 2018 6:07 am 
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Joined: Sun Oct 15, 2006 7:02 pm
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Location: Reading, Saabshire
Car Model: Merc A200d AMG 7sp DCT
Even back in the day those metric tyres were shocking.
A 900 Turbo running on good boost would actually spin the wheels inside the tyres causing damage to the tyre.

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PostPosted: Fri Jul 06, 2018 8:25 pm 
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Paul Taylor wrote:
Even back in the day those metric tyres were shocking.
A 900 Turbo running on good boost would actually spin the wheels inside the tyres causing damage to the tyre.


I seem to recall that the rims seemed to 'wear out' in the bead area where the tyre contacts the rim, possibly for the reason you suggest.

Would be nice to keep the original wheel / tyre combination but suggest you have a good look at the condition of the rims with the tyres removed before you splash out on new rubber.


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PostPosted: Fri Jul 06, 2018 11:28 pm 
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Car Model: Saab 900 Turbo 1980
Its interesting you say they wear out on the bead as i have 8 wheels with aging rubber and 3 of them wont hold pressure for long.
How does the alloy surface wear and how do I tell if the rim is finished.
Love the look of the wheels but why oh why do they have to have these tyres


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PostPosted: Sat Jul 07, 2018 8:24 am 
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Location: Reading, Saabshire
Car Model: Merc A200d AMG 7sp DCT
JonBentley wrote:
Love the look of the wheels but why oh why do they have to have these tyres


It was a bit of a fad at that time. Even Ford Granada's of the same vintage had metric tyres & Some super cars too.
My Renault Alpine GTA V6 Turbo originally had Metric tyres. I removed them and fitted some nice 9.5" Azev A wheels with massive 275 tyres.
Not sure what the interest was since the tread pattern is very noisy at high speed.

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PostPosted: Sat Jul 07, 2018 9:21 am 
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Location: Devon
Paul Taylor wrote:
Not sure what the interest was since the tread pattern is very noisy at high speed.

The point was to design the wheel and tyre together to make a low-profile tyre for performance while giving better comfort than other low-profile tyres at the time. As far as I know, the sole reason for using metric wheel and tyre sizes was to avoid confusion with standard tyres, since TRX (and TDX) wheels and tyres weren't interchangeable with standard wheels and tyres (the wheel rim is a different shape).

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PostPosted: Sat Jul 07, 2018 1:34 pm 
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Joined: Fri Aug 05, 2005 7:42 pm
Posts: 1901
Location: PRESTON. LANCASHIRE
Car Model: 9000 Aero, 900 Ruby, + others
Paul Taylor wrote:
JonBentley wrote:
Love the look of the wheels but why oh why do they have to have these tyres


It was a bit of a fad at that time. Even Ford Granada's of the same vintage had metric tyres & Some super cars too.
My Renault Alpine GTA V6 Turbo originally had Metric tyres. I removed them and fitted some nice 9.5" Azev A wheels with massive 275 tyres.
Not sure what the interest was since the tread pattern is very noisy at high speed.


I rember an Austin super car that had the metric tyres as well....
The wife had an early eighties 1.0 ltr metro that you also had to fit metric tyres to.


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PostPosted: Sat Jul 07, 2018 6:23 pm 
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steve9000Aero wrote:
I rember an Austin super car that had the metric tyres as well....
The wife had an early eighties 1.0 ltr metro that you also had to fit metric tyres to.

BL or its descendents used TDX wheels and tyres, which were Dunlop's answer to Michelin's TRX.

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