omega
Posted a lot
Posts: 1,060
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Dec 21, 2013 18:39:17 GMT
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if I fit 175x70x14 on the front axel and 175x65x14 on the rear axel is this legal?
cheers
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Colin
Part of things
Posts: 239
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Dec 21, 2013 18:44:12 GMT
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As long as they are matched pairs on each axle.
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bl1300
Posted a lot
Posts: 1,678
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Dec 21, 2013 18:47:11 GMT
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yep on the rules are that you can't mix tyre sizes on the same axle but it is fine on different axles
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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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Copey
Posted a lot
Posts: 2,845
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Dec 21, 2013 19:36:52 GMT
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yeah, run different tyre sizes front and rear on my capper and saph, hell, the Capri even has different size wheels front to back!
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1990 Ford Sierra Sapphire GLSi with 2.0 Zetec
1985 Ford Capri 3.0 (was a 2.0 Laser originally)
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Dec 21, 2013 22:44:17 GMT
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The smaller circumference tyre should be one the front.
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omega
Posted a lot
Posts: 1,060
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Dec 22, 2013 12:38:36 GMT
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The smaller circumference tyre should be one the front. daft question why is this? |
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Dec 22, 2013 13:17:33 GMT
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The smaller circumference tyre should be one the front. On taste/sensibility grounds, probably. I'm pretty sure there's no legal basis for it. |
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omega
Posted a lot
Posts: 1,060
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Dec 22, 2013 13:28:21 GMT
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the plan was to use the bigger tyres on the front so higher gearing =more mpg
its a front wheel drive daily.
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bortaf
Posted a lot
Posts: 4,549
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Dec 22, 2013 14:03:40 GMT
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the plan was to use the bigger tyres on the front so higher gearing =more mpg its a front wheel drive daily. With that small a change in size you wont notice any better fuel economy and the speedo will be out if differant to the normal tyre size ? whats the normal tyre size ? |
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R.I.P photobucket
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Bolf
Part of things
Posts: 507 
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Dec 22, 2013 14:29:50 GMT
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I run 18's rear and 17's front sometimes on my track car.
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omega
Posted a lot
Posts: 1,060
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Dec 22, 2013 16:53:27 GMT
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I run 18's rear and 17's front sometimes on my track car. |
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stealthstylz
Club Retro Rides Member
Posts: 14,840
Club RR Member Number: 174
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tyres is this legal?stealthstylz
@stealthstylz
Club Retro Rides Member 174
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Dec 22, 2013 21:11:03 GMT
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I tried this with my old Mk3 Astra diesel, it made sod all difference whatever size I tried (stock was iirc 175 60 14, I went as tall as 175 R14 which was actually worse, but most between didn't make a difference)
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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tyres is this legal?ChasR
@chasr
Club Retro Rides Member 170
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Dec 22, 2013 21:28:29 GMT
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I tried this with my old Mk3 Astra diesel, it made sod all difference whatever size I tried (stock was iirc 175 60 14, I went as tall as 175 R14 which was actually worse, but most between didn't make a difference) I found this with my old Ka and the difference was not as severe as other cars (I went from 195/50 to 45). 45 is the correct size for the car. Besides gaining fuel economy the car actually was able to move (it was very sluggish on the 50s). Weight may have been one difference but that was negligable. The reduction in profile was worth the fuel savings alone (but that car was always thirsty (around 36MPG, pretty poor from a 1.3 if you ask me!). Another thing to bear in mind is that on the VW BlueMotion Passats, VW changed from 215/55R16 to the smaller diameter 205/55s that the earlier cars came with  . |
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AB car pix
Posted a lot
Car mag' snapper
Posts: 1,337
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Dec 22, 2013 23:02:54 GMT
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the plan was to use the bigger tyres on the front so higher gearing =more mpg its a front wheel drive daily. Very common for drift cars to use small at the rear and big up front... Especially BMWs. Pretty 17" road wheels, then take off the rears and fit track 15s for a higher final drive to compensate for terrible OE gearing. Plus also get the bonus of cheaper/easier to scrounge tyres! Never had any legal issues when I've occasionally had to run drift cars on the road with this type of setup either.  |
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1979 Chrysler Horizon 1.3 GL 1980 Ford Granada 2.8 Ghia 1985 Ford Sierra 3dr 1985 Ford Escort Mk3 1988 Ford Sierra Sapphire Cosworth 1989 Ford Escort 1.3 Popular 1995 Volvo 960 1996 BMW 525i 1998 BMW 323i 1999 BMW 530d 2003 BMW 530i . www.facebook.com/ABCARPIX |
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Dec 22, 2013 23:16:46 GMT
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weve had this arguement at work before and i think a car will fail its mot with bigger tyres on the front.you have to have the bigger tyre/wheels on the rear.unless its an old citroen ds where it is legal to have bigger fronts as thats how they were made.i think
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VIP
South East
Posts: 8,293
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Dec 22, 2013 23:22:18 GMT
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weve had this arguement at work before and i think a car will fail its mot with bigger tyres on the front.you have to have the bigger tyre/wheels on the rear.unless its an old citroen ds where it is legal to have bigger fronts as thats how they were made.i think Utter nonsense |
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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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Dec 22, 2013 23:40:11 GMT
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You also see FWD campers and chassis-cabs with small diameter wheels out back, to lower the load area. As said, as long as they're all radials, the only MOT restriction's that each axle must have matching sizes.
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Bolf
Part of things
Posts: 507
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I run 18's rear and 17's front sometimes on my track car. You quoted me and said nothing  |
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omega
Posted a lot
Posts: 1,060
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You quoted me and said nothing |
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Last Edit: Dec 24, 2013 8:44:56 GMT by omega
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omega
Posted a lot
Posts: 1,060
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You quoted me and said nothing |
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. 
