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Old 09-06-2020, 08:37 PM   #1
TonyBlack
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Default 1303S tyres

Hi, this is my first post. Could anyone advise what size tyre was standard fitment on a ‘78 1393S please, and what sizes would fit my Fuchs type rims without fouling the bodywork?
I’m not looking for anything wild to keep the drive near to original and not make steering too heavy.
Many thanks for forum thoughts
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Old 10-06-2020, 10:41 AM   #2
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Hi, this is my first post. Could anyone advise what size tyre was standard fitment on a €˜78 1393S please, and what sizes would fit my Fuchs type rims without fouling the bodywork?
I€™m not looking for anything wild to keep the drive near to original and not make steering too heavy.
Many thanks for forum thoughts
Standard size was 155/15, but they're relatively rare nowadays. 165/15 is a commn replacement. I like Vredestein sprint classics myself.

"will it fit" is a very difficult question to answer, but if your Fuchs ET and thickness is per standard VW wheels, you're unlikely to be able to go over 185mm without rubbing.
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Old 10-06-2020, 03:45 PM   #3
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Hi Happystamps,
Thanks very much for that advice. Do you think 165 tyres make much difference to the gearing or put the speedo out by much?
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Old 12-06-2020, 02:40 PM   #4
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Hi Happystamps,
Thanks very much for that advice. Do you think 165 tyres make much difference to the gearing or put the speedo out by much?
Honestly, not really.
You won't notice the difference in gearing.
It'll make the speedo read about 2.5% fast, and your speedo probably shows a bit slow anyway (everything being to a tolerance, it was better for manufacturers to make their speedos read slightly fast, to avoid getting involved in speeding fine lawsuits). I found that when I upped to 165s the speedo was more accurate compared to GPS.
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Old 16-06-2020, 05:41 PM   #5
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Thanks for that info. My VW has 4.5 inch rims at the front and 5.5 rears.It's currently sitting in 160/80 tyres at the front and 185/65 at the back which seems an unusual size. What you think the rears will do to the gearing? Thanks for your input; appreciated
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Old 16-06-2020, 09:46 PM   #6
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you can use this site https://tiresize.com/tyre-size-calculator/
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Old 17-06-2020, 05:41 PM   #7
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That's very helpful,thanks!
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Old 17-06-2020, 11:29 PM   #8
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Rule of thumb is 20mm wider and 10 percent lower profile = same diameter.

165/80 = 185/70 = 205/60 and so on.

For 5.5" rears take 155/80 to 195/60 which is common size, but 195/65 more so and fits ok.

For 4.5" more of a challenge as don't want to wider than 165 ish, need to see what's available at right price, 175/65 seem quite common
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Old 05-07-2020, 07:12 PM   #9
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Honestly, not really.
You won't notice the difference in gearing.
It'll make the speedo read about 2.5% fast...
Surely tyres with a larger rolling radius make the speedo read slow...
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