Technical Tyre profile measurements

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Technical Tyre profile measurements

Bushboy

Chris
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I worked these out the other day for my own interest to see how tyre profiles compare. Ive only done tyres that will fit a cento based on sizes upto 15". Also you have to remember, the smaller the overall diameter, the better the acceleration.

thought they might be of use to some of you :)

13" wheel = 33.01cm

165/55 (sporting standard tyre) = Wall height of 9.07cm
- Over all wheel diameter running 165/55 = 51.16cm

175/50 tyre = Wall height of 8.75cm
- Over all wheel diameter running 175/50 = 50.52cm

195/45 tyre (super wide) = Wall height of 8.77cm
- Over all wheel diameter running 175/50 = 50.56cm


14" wheel = 35.56cm

175/50 (standard sei abarth tyre) = Wall height of 8.75cm
- Over all wheel diameter running 175/50 = 53.06cm

185/50 = Wall height of 9.25cm
- Over all wheel diameter running 185/50 = 54.06cm

195/45 = Wall height of 8.77cm
- Over all wheel diameter running 195/45 = 53.10cm

195/40 (super low profile) = Wall height of 7.80cm
- Over all wheel diameter running 195/40 = 51.16cm
195/40 tyres on a 14" wheel make the overall diameter of the wheel the same as the standard sporting wheels.


15" wheel = 38.1cm

195/45 = Wall height of 8.77cm
- Over all wheel diameter running 195/45 = 55.64cm
 
Last edited:

StoneNewt

Scandinavian Passion....
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I've been playing about with gearboxes and differentials theoretically so have also had a look at what tyres and have this to add:

15" wheel = 38.1cm

165/50 (Toyo Proxes R888 & Nankang NS-2) = Wall height of 8.25cm
- Over all wheel diameter running 165/50 = 54.6cm

165/560 (racing wet, effectively: 165/55) = Wall height of 9.5cm
- Over all wheel diameter running 165/560 = 56cm

170/550 (common slick profile, effectively:165/55 ) = Wall height of 8.45cm
- Over all wheel diameter running 170/550 = 55cm

175/50 = Wall height of 8.75cm
- Over all wheel diameter running 175/50 = 55.6cm

185/45 = Wall height of 8.35cm
- Over all wheel diameter running 185/45 = 54.8cm


16" wheel = 40.6cm

175/45 (driveable w/out moding on stock Sei suspension!) = Wall height of 7.88cm
- Over all wheel diameter running 175/45 = 56.4cm

195/40 = Wall height of 7.80cm
- Over all wheel diameter running 195/40 = 56.2cm
 
Joined
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Bushboy said:
13" wheel = 33.01cm

165/55 (sporting standard tyre) = Wall height of 9.07cm
- Over all wheel diameter running 165/55 = 51.16cm

Iam wondering who's making this measure of tyres?? I can't find them.. And Ive got already on car some "NANKACH" taiwan or something
 

custard

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standard profile is very rare to find,cant recall the make .possibly pirrelis but why so many change to a more common profile
 
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custard said:
standard profile is very rare to find,cant recall the make .possibly pirrelis but why so many change to a more common profile

And what's the best replace(and cheap) for 165/55 ?? (car is a nicely low with it:D )
 

custard

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Diwiak said:
And what's the best replace(and cheap) for 165/55 ?? (car is a nicely low with it:D )
perhaps the list in the 1st post and the whole point of the thread may help :chin:
 

chaos

Ah. Not good...
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custard said:
standard profile is very rare to find,cant recall the make .possibly pirrelis but why so many change to a more common profile

165/55s? You should be able to get hold of them fairly easily. There are only 3 suppliers IIRC - Nankang, Pirelli (which Fiat fitted from new) and I think Goodyear did them as well, but not sure if they produce them now. The Nanknags are half the price of both the Pirellis and the Goodyears.
 

StoneNewt

Scandinavian Passion....
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Profiles that match near enough are (added in a sidewall deformation factor) 165/55 (8.62cm/51.2cm) are 155/60 (8.84cm/51.6cm), 185/50 (8.79cm/51.5cm) & 205/45 (8.76cm/51.5cm). I think you'll find none of the alternatives are actually in production :(
 
Joined
Mar 20, 2006
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Liverpool
Originally Posted by Bushboy
13" wheel = 33.01cm

165/55 (sporting standard tyre) = Wall height of 9.07cm
- Over all wheel diameter running 165/55 = 51.16cm

Are these not the p700 Pirellis? Others will suggest different brands, but Kwik Fit have a 3 for the price of 4 offer on pirelli at the moment.

Liverpool Tyres always seem to have very good part worns in P700 165/55/14 -- they're stock fitment on the mpi sei too.
 

Luke M

Formerly mog1571
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fingers99 said:
Are these not the p700 Pirellis? Others will suggest different brands, but Kwik Fit have a 3 for the price of 4 offer on pirelli at the moment.

Liverpool Tyres always seem to have very good part worns in P700 165/55/14 -- they're stock fitment on the mpi sei too.

3 for the price of 4? rip off! :p
 
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Since when?
Er....2002? Certainly my Sei MPI S came with them out of the factory (now, mine was an ex Hertz car and it's just possible that the tyres were trashed in 10,000 miles, but I doubt it. Hell I took em off and they're out in the yard, will take a look...... yep, 165/55/13 P700.:)

Oh pooh, I just saw I typed 14 instead of 13!:eek:
 
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