The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: TYRE SIZES FOR 1500 HL
PostPosted: Tue Sep 14, 2010 7:06 am 
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Joined: Wed Apr 28, 2010 1:33 pm
Posts: 94
I need to replace the Goodyear tyres on my 1500HL due to perishing and age which is a shame as the tyres have good tread, and i have been offered a set of either 155/65 or or 165/70 13 tyres would these be ok on the standard rims, and would they be ok as far as the rolling radius is concerned and the speedo reading being ok, I would like to fit a bit wider as i think that the standard 155 are a bit narrow but if i have to refit that size then so be it,is it 155/80 these days? . What is the max size that will fit the standard rim 4.5j x 13 out of interest? any ideas suggestions will be helpful

 Post subject: I am........
PostPosted: Tue Sep 14, 2010 9:18 am 
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Joined: Thu Aug 09, 2007 12:22 pm
Posts: 6221
Location: Caithness, Scotland
Fairly sure that 175/70 x 13 is the same rolling radius as 155/80 x 13.

If you want to improve stability, fitting different wheels to fill the arches more is necessary I feel.
I have Minator wheels (supplied by Rimmer Bros) and Vredstein 175/70 x 13 tyres on my car along with
Superflex bushes and standard springs/shock absorbers. It corners well and has positive handling.

Does a 1500HL have an anti roll bar on the back? These improve stability.
If the suspension bushes/joints/shocks etc are worn changing wheels/tyres will be compromised.

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PostPosted: Tue Sep 14, 2010 9:29 am 
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Joined: Tue Oct 03, 2006 8:45 pm
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Location: Middlesex
I have 175/70's on 4.5J rims on one of mine. It isn't the best as it makes the steering a tad heavy, but the gearing/rolling radius is almost identical.

The guy on minty lamb does a cracking tyre size and gearing calculator and there is a Rove SD1 guy who has the same. You can google it easilly enough.

I reckon 165/70's would also be okay but would reduce the gearing a little. that being said I find old Triumph speedos tend to under read a bit as they get older, so that's no bad thing. The rev counter is usually a bit more accurate and you can always callibrate both against a sat nav.

I still reckon the 5.5J Sprint alloys and 175/70 is the best combo but the SE wheels may also be good as they are 5 J I think, so would work well with 175/70's


Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.

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