175SR 14 tyres

[Sid123]

Hi
What is the 'modern' equivalent to this tyre size which seems hard to find.
I have read that 185/75 14 have virtually the same diameter but most of what I find are van tyres.
The car is a '72 Lancia HF 2000 Coupe and any suggestions much appreciated.
Thank you.

[Smint]

175/80 x 14, of which there are plenty.

[droopsnoot]

Is this any help for alternative sizes? https://www.longstonetyres.co.uk/tyres/175-14.html

[Sid123]

OK so it's 175/80 14.
I'll take a look.
Thank you for your help. Much appreciated.

[Smint]

I'm fairly sure from my tyre fitting days (53 years ago for crying out loud, where did the time go) that the standard aspect ratio of most if not all radial sizes lacking a specific figure was 80% hence an 80 covers almost all.
ie 195 x 14 would also be 80%.

Not sure what the odd metric size equivalents are, from my appalling memory Citroen DS models (real ones not the current offerings) were 165 x 400 Michelin XAS, not a clue what size you'd be looking for if lucky enough to have a DS21 on your drive.
I think cross plies in imperial sizes were similarly 80% but happy to be corrected if that was different, i know looking at a 560 x 14 Dunlop Denovo for instance the sidewall appears to be as high as the tread was wise, be interesting to know if someone has the specs.

Edited by Smint on Tuesday 3rd June 18:54

[Sid123]

Thank you

[gt40steve]

80% aspect ratio means 80% of the width is 'height' of the tyre.

So as you go 175/80, 185/80, 195/80. Thus 80% of 175, 185, or 195 millimeters causes the overall diameter to increase each time.

There are overall diameter calculators on some tyre websites.

[M138]

Triumph Stags were originally fitted with 185 14 tyres and the options a few years back when I owned a stag was Michelin MXV Classic (very expensive) or the cheaper option Vredestein ( cheaper but still expensive)

[courty]

These will ride and handle really well. I had 165r14 on my Alfa.
Whether you want to dig that deep is another question, but I can't have modern tyres on my Alfa now I have experienced the classic Pirelli and Michellin from Longstone.
https://www.longstonetyres.co.uk/175hr14-michelin-...

[Sid123]

Is that an aesthetic-based choice as it maintains the 'correct' look and as you won't tearing around on a race track.....ie sensible and sympathetic?

[Benzinaio]

175R14 has the same diameter as 195/70r14.
If you put 20mm on the width you take 10% off the aspect ratio (profile)
If you increase rim diameter by one inch you decrease profile by 5% so long as you keep the same width.
To keep gearing/speedo reading the same, when looking at equivalents, it's the 'Static laden radius' rather than diameter that is used to measure the revolutions per mile due to tyres having some 'squish' at the bottom.
Tyre sizes are a unique thing as they are a mixture of imperial (rim diameter in inches), metric (width in mm), and a percentage (profile).

Edited by Benzinaio on Thursday 5th June 19:06