The number measurements for tyres.....What do the mean? For example the furby vRS is 205/45/16

I know the 16 is the size i.e. the diameter but whats the 45 and the 205? Does it matter (for example) If i put 205/40/16 on a furby? or does it have to be those exact measurements???

205 is the width of the tyre in mm. 45 represents the size of the sidewall, and is a percentage of the width (eg. 45%).

So you have a width in mm, a profile size as a percentage, and a rim size in inches...

If you put 40s on, they'll be lower profile, so your overall rolling radius will be slower, which may put your speedo/odometer out.

Rob.

The 205 is the width of the tyre (in millimetres), and the 45 is the ratio of the depth of the sidewall to the width of the tyre (i.e. 205*0.45 = 92.25mm for the depth of the sidewall)

As for the reason why there's a mixture of inches, millimetres and fraction, I don't know.

The letter ('V' for example) is the speed rating - the later the letter is in the alphabet, the faster the tyre can safely go.

So there you have it!

Damn... you beat me to it!

The most important number to remember Eatsoot is 4 as this is the number of inflated tyres you should have.

Any less that 4 and the Fabia handles like Vannessa Feltz in the Romanian Cluster position.

Romanian Cluster position.

:confused:

Rob.

As for the reason why there's a mixture of inches, millimetres and fraction, I don't know.

Didn't Leyland/BL/Austin/Rover (delete as appropriate) fit "Millimetric" rims on the MG Maestro? These were Metric sized rims whith tyre availability rarer than hens teeth and rocking horse *hit combined.

Sure "Millimetric" rims had other benifits other than the fact they were measured in Metric size?

Interestingly H appears between U and V in the speed ratings :confused: And don't forget tyres also have a load rating.

See here for more info

Chris

Metro tyres were outrageously priced, iirc only a few makes to choose from. Dunlop were the main one who actually developed the wheel/tyre combo for BL...idiots.

Didn't Leyland/BL/Austin/Rover (delete as appropriate) fit "Millimetric" rims on the MG Maestro? These were Metric sized rims whith tyre availability rarer than hens teeth and rocking horse *hit combined.

Sure "Millimetric" rims had other benifits other than the fact they were measured in Metric size?

I seem to remember that Michelin produced a tyre back in the 1980's called a TRX which was measured in metric units. Some top of the range Mk 2 2.8i Granadas had them, IIRC.

Might be of use...

Marking Charactistics

Speed Symbol "N" For vehicles with a speed capability not exceeding 140 Km/h (88 Mph)

Speed Symbol "P" For vehicles with a speed capability not exceeding 150 Km/h (94 Mph)

Speed Symbol "Q" For vehicles with a speed capability not exceeding 160 Km/h (100 Mph)

Speed Symbol "R" For vehicles with a speed capability not exceeding 170 Km/h (106 Mph)

Speed Symbol "S" For vehicles with a speed capability not exceeding 180 Km/h (113 Mph)

Speed Symbol "T" For vehicles with a speed capability not exceeding 190 Km/h (119 Mph)

Speed Symbol "U" For vehicles with a speed capability not exceeding 200 Km/h (125 Mph)

Speed Symbol "H" For vehicles with a speed capability not exceeding 210 Km/h (130 Mph)

Speed Category "VR" For vehicles having speed capability over 210 Km/h (e.g. 195.50 VR 15)

Speed Category "ZR" For vehicles with a speed capability over 240 Km/h (e.g. 205.40 ZR 17)

Speed Symbol "V" For vehicles with a speed capability not exceeding 240 Km/h (e.g. 225.55 R 15 91V)

Speed Symbol "W" For vehicles having speed capability not exceeding 270 Km/h (e.g. 225.60 R 15 96W)

Speed Symbol "Y" For vehicles having speed capability not exceeding 300 Km/h (e.g. 275.40 R 18 94Y)

ZR+ Speed Symbol "W" Tyres marked with both designations for vehicles with speed capability over 240 Km/h but not exceeding 270 Km/h

ZR+ Speed Symbol "Y" Tyres marked with both designations for vehicles with speed capability over 240 Km/h but not exceeding 300 Km/h

Might be of use...

Marking Charactistics

Speed Symbol "W" For vehicles having speed capability not exceeding 270 Km/h (e.g. 225.60 R 15 96W)

That means that I have to keep the Octy under 168 mph

That means that I have to keep the Octy under 168 mph

Got to wonder why the Furby needs W rated tyres really...

The Wheel and Tyre Bible below is also an excellent reference for tyre information:

http://www.chris-longhurst.com/carbibles/index.html?menu.html&tyre_bible.html

For those wanting to go wider but keep the same rolling radius and not bugger up their speedo reading:

http://www.tyresave.co.uk/tyresize.html