Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,790
Club RR Member Number: 34
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Jul 20, 2011 22:05:42 GMT
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dan is 100% correct, no laws at all regarding which end of a vehicle the bigger tyres have to go on.
i would always put the larger ones on the driven axle, which on a fwd hatch would obviously be the front!
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stealthstylz
Club Retro Rides Member
Posts: 14,960
Club RR Member Number: 174
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Jul 20, 2011 23:55:58 GMT
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I didn't think there would be, just wanted to see if the guy who posted that 'fact' had any proof tbh.
Matt
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In Japan the FWD touge racers (almost) all use wider tires at the front to reduce understeer.
Must try the trick on the Micra, I have still the stock 155/70R13 tires which should go nicely with the 165/60R14 front tires.
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 Click picture for more |
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I've tried this. Accidentally. I just lobbed a set of wheels on a car I'd got at home and had 50:50 mix of crossies and radials by chance. Even at round town speeds it was like driving on ice. Wild.
Its as bad as the public information film suggests...
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Last Edit: Jul 21, 2011 9:15:48 GMT by akku
1941 Wolseley Not Rod - 1956 Humber Hawk - 1957 Daimler Conquest - 1966 Buick LeSabre - 1968 Plymouth Sport Fury - 1968 Ford Galaxie - 1969 Ford Country Squire - 1969 Mercury Marquis - 1970 Morris Minor - 1970 Buick Skylark - 1970 Ford Galaxie - 1971 Ford Galaxie - 1976 Continental Mark IV - 1976 Ford Capri - 1994 Ford Fiesta
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Jul 21, 2011 10:38:37 GMT
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I'm sure I've heard of production cars with wider front than rear tyres. Some mad FWD performance thing. Not necessarily one sold in the UK though not that this helps LOL. I wonder if westy180 is thinking of the business about crossply on the front, radial on the rear and not the other way around. There was a story you could put the crossply on the back if they were over a certain size (with many old rods back in the day running big bias belt Grabbers on the back and 135 radials on the front) but I think this was also an urban myth. The law was that you could run crossplies/bias on the rear and radials on the front as long as the rear tyres were over 12" wide. The only ones apart from the prostreet sizes (MTs and others) was N50x15. That said the law may have changed since then. |
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1953 Minor (Long term project)
PT Cruiser
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kevfromwales
Posted a lot
the conrod's REALLY out the block now!
Posts: 3,909
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Jul 21, 2011 11:30:19 GMT
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I ran an illegal mix of 7.50R16's on the front, and 7.50x16 crossplies on the rear on the truck once - as 'ku says it made handling 'interesting'
- maybe we'll see a whole new crowd of drifters using 5.40x13 x-plies on the back!
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Almost on the road: b11 sunny breadvan, e36 tds, 325i skidcar,
nearly there: ford f250 tathauler, suzuki alto, u11 bluey
not for a while: ford pop, 32 rails,
not in this lifetime: ruby, '29 hillman
''unfortanatly I'm quite old and scruffy and in need of some loving. my drive shaft needs a new boot....''
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Jul 21, 2011 11:48:42 GMT
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i'm running 145/80/15 on fronts and 225/60/15 on rear, not had any problems yet.
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bl1300
Posted a lot
Posts: 1,678
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Jul 21, 2011 14:13:03 GMT
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I asked that question of my local tyre fitter and just repeated what he said and "that was that wider tyres should always be fitted to the rear of a vehicle."
Hence why I stated what I had been told by a proffesional was the correct way of doing it. Also incorrect sized tyres can effect the steering geometry of the vehicle. As wider and differing profile tyres effect the wheels camber. hence why it is always better to fit the not right ones to the back of the car as they are generally not steering wheels.
That comes from my old vehicle suspension and steering systems lecturer.
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Current fleet.
1967 DAF 44
1974 VW Beetle 1303s
1975 Triumph Spitfire MkIV
1988 VW LT45 Beavertail
1998 Volvo V70 2.5
1959 Fordson Dexta
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VIP
South East
Posts: 8,299
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Jul 21, 2011 15:08:44 GMT
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I asked that question of my local tyre fitter and just repeated what he said and "that was that wider tyres should always be fitted to the rear of a vehicle." Hence why I stated what I had been told by a proffesional was the correct way of doing it. Also incorrect sized tyres can effect the steering geometry of the vehicle. As wider and differing profile tyres effect the wheels camber. hence why it is always better to fit the not right ones to the back of the car as they are generally not steering wheels. That comes from my old vehicle suspension and steering systems lecturer. a) A local tyre fitter does not necessarily equal a 'professional'. b) Having the incorrect tyre size on the front wheel may affect steering geometry, but it has naff all to do with how big the rear tyres are. |
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bl1300
Posted a lot
Posts: 1,678
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Jul 21, 2011 15:23:24 GMT
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I asked that question of my local tyre fitter and just repeated what he said and "that was that wider tyres should always be fitted to the rear of a vehicle." Hence why I stated what I had been told by a proffesional was the correct way of doing it. Also incorrect sized tyres can effect the steering geometry of the vehicle. As wider and differing profile tyres effect the wheels camber. hence why it is always better to fit the not right ones to the back of the car as they are generally not steering wheels. That comes from my old vehicle suspension and steering systems lecturer. b) Having the incorrect tyre size on the front wheel may affect steering geometry, but it has naff all to do with how big the rear tyres are. Isn't that what I just said in that you want the incorrect size on the rear of the car so as not to effect steering geometry. I read it that the new tyres where the larger ones hence putting them on the back. Of course a wider tyre may foul when on full steering lock which is another reason for putting them on the back |
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Current fleet.
1967 DAF 44
1974 VW Beetle 1303s
1975 Triumph Spitfire MkIV
1988 VW LT45 Beavertail
1998 Volvo V70 2.5
1959 Fordson Dexta
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VIP
South East
Posts: 8,299
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Jul 21, 2011 15:42:51 GMT
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b) Having the incorrect tyre size on the front wheel may affect steering geometry, but it has naff all to do with how big the rear tyres are. Isn't that what I just said in that you want the incorrect size on the rear of the car so as not to effect steering geometry. I read it that the new tyres where the larger ones hence putting them on the back. Of course a wider tyre may foul when on full steering lock which is another reason for putting them on the back If we are talking about this specific example, the difference between a 175 and a 185 tyre is so insignificant, it will have no effect on either geometry and clearance. |
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stealthstylz
Club Retro Rides Member
Posts: 14,960
Club RR Member Number: 174
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Jul 21, 2011 22:27:24 GMT
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Also incorrect sized tyres can effect the steering geometry of the vehicle. As wider and differing profile tyres effect the wheels camber The width of the tyre doesn't have any effect on the camber. If you have one pair of tyres that is taller than the other by rights it is much safer to put the shortest pair on the rear, as this will increase the castor angle. If you put the taller tyres on the rear you will reduce the castor angle which can cause interesting things to happen with the steering. |
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Jul 21, 2011 23:56:53 GMT
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What matt says, no tyre change will ever effect camber, you could bolt a rubber duck to the hub and it'll still have the same camber angle*. Changes in diameter can** effect the roll centre, scrub radius and track change as well as the 'trail' distance. (The distance from the steering centreline and the hub centre at the road surface) which will effect steering, however in this instance the diameter is near enough identical, and width has no bearing on any of these. *assuming a matching rubber duck was fitted to the other wheel on that axle so the suspension remained at the same point in its travel 
**can, not will |
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Last Edit: Jul 21, 2011 23:59:39 GMT by RobinJI
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VIP
South East
Posts: 8,299
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I didn't think tyre width affected camber either, but wasn't 100%, which is why I put 'may' in my reply.
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Another epic thread. VIP, according to Westy180 and BL1300, your current project is completely illegal. Just think of the massive camber change and drastic affect on handling your wider tyres on the front will have. You should know better |
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VIP
South East
Posts: 8,299
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Jul 22, 2011 12:41:59 GMT
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I fail, I'm going to go into a corner and cry.
Once I've recovered, I'll be setting fire to the project in embarrassment...
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Jul 22, 2011 12:50:23 GMT
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Just make sure to set equal sized fires under both axles, otherwise one may burn faster than the other due to adverse geometry.
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VIP
South East
Posts: 8,299
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Jul 22, 2011 12:57:53 GMT
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Just make sure to set equal sized fires under both axles, otherwise one may burn faster than the other due to adverse geometry. lulz... |
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smellyferret
Posted a lot
Back in a retro after 7 years!
Posts: 1,121
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Jul 22, 2011 22:25:35 GMT
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Ontopic: With partworns I'd be more concerned with the age / perishedness of them than minor width differences. I've never fitted part worns but those I have seen, a lot of them have been perished on tyre walls... Now maybe I have seen some dodgy ones, but imho thats potentially more dangerous.. unless the diameters were up the spout..
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stealthstylz
Club Retro Rides Member
Posts: 14,960
Club RR Member Number: 174
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Jul 22, 2011 22:39:16 GMT
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It's illegal to sell dodgy partworns. Also you get them on every car you buy.
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