Ryannn
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Oct 17, 2018 15:09:12 GMT
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Looking for some new tyres for a Bedford Rascal. The reg isn’t recognised on the usual sites so I need to order by size. The picture below shows the size of the tyres currently on but I think they’re older than me! Haha How to I translate this back to English? Are they 155/80? Is R12 the rim diameter as normal? Nightmare Cheers guys  |
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tristanh
Part of things
Routinely bewildered
Posts: 990 
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Oct 17, 2018 15:13:03 GMT
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The /80 etc is a percentage of the tread with, as a measurement of the sidewall height.
So you have 155 width, standard tall sidewall, and on a 12 inch rim.
A 155 80 12 would fit, would just be lower profile.
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Whether you believe you can, or you cannot, you're probably right.
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colnerov
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Oct 17, 2018 15:35:25 GMT
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Hi, As said plus the 'R' denotes that it's a radial, the 'C' denotes that it's a commercial tyre and the '8PR' denotes that it's an 8 ply tyre. Car tyres are usually 4 ply, 6, 8, or more are for heavier duty or commercial use. There will also be a date code possibly as well but by the look of it, it has some age to it.
Colin
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Ryannn
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Oct 17, 2018 15:50:14 GMT
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As we’re only talking about a rascal... am I going to run into any problems if I put some lower profile car tyres on? I’m thinking 145 or 166 by 60.
It never carries any loads.
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Rich
Club Retro Rides Member
Posts: 6,234
Club RR Member Number: 160
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How do I translate this tyre size?Rich
@foxmcintyre
Club Retro Rides Member 160
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Oct 17, 2018 16:14:06 GMT
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The /80 etc is a percentage of the tread with, as a measurement of the sidewall height. So you have 155 width, standard tall sidewall, and on a 12 inch rim. A 155 80 12 would fit, would just be lower profile. No profile USED to be 100. But they changed it yonks ago to be 80 if not quoted, for reasons that elude me. So I would say a Rascal is a 155 80 R12C, and not 155 100 R12C. Lower profile will fit, but affect the gearing and speedo, which you can see the effect of here: willtheyfit.com |
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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: 11,712
Club RR Member Number: 34
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Oct 17, 2018 18:12:50 GMT
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If a radial tyre has no aspect ratio specified it is 82%. So close to 80% any difference is negligible. Radial tyres have never been 100% aspect.
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kenb
Part of things
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Oct 17, 2018 22:15:49 GMT
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Phil H
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How do I translate this tyre size?Phil H
@philhoward
Club Retro Rides Member 133
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You should be using “C” tyres assuming that’s the original spec (likely) as it’s whats it can carry, not necessarily what you will actually carry.
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Last Edit: Oct 18, 2018 7:09:31 GMT by Phil H
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Rich
Club Retro Rides Member
Posts: 6,234
Club RR Member Number: 160
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How do I translate this tyre size?Rich
@foxmcintyre
Club Retro Rides Member 160
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Oct 18, 2018 10:21:08 GMT
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If a radial tyre has no aspect ratio specified it is 82%. So close to 80% any difference is negligible. Radial tyres have never been 100% aspect. That's probably what I was trying to remember to be honest, the change from 100% to 82 was probably when radial became a thing. I remember being taught about it but it was so long ago and not really overly important to the pace the motor industry moves at tech-wise it was pushed from my brain. |
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Rich
Club Retro Rides Member
Posts: 6,234
Club RR Member Number: 160
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How do I translate this tyre size?Rich
@foxmcintyre
Club Retro Rides Member 160
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Oct 18, 2018 10:22:21 GMT
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You should be using “C” tyres assuming that’s the original spec (likely) as it’s whats it can carry, not necessarily what you will actually carry. To be honest, a Rascal weighs so little and provided the OP doesn't actually want to carry 2 washing machines in it it's not too much of an issue to deviate from the C rating PROVIDED the rating of the chosen tyre is within a sensible limit of that of the vehicle. |
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Phil H
Posted a lot
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Club RR Member Number: 133
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How do I translate this tyre size?Phil H
@philhoward
Club Retro Rides Member 133
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Oct 18, 2018 10:46:05 GMT
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That’s the minefield  I’ve no idea what the GVW/axle weights are for a Rascal either - and coincidentally what the rating of available tyres is either. It’s also (as I said) what the VIN plate says in terms of the axle weight (what it can theoretically carry) as opposed to what the intended use actually is. |
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colnerov
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Oct 18, 2018 11:07:55 GMT
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Last Edit: Oct 18, 2018 11:17:37 GMT by colnerov
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Rich
Club Retro Rides Member
Posts: 6,234
Club RR Member Number: 160
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How do I translate this tyre size?Rich
@foxmcintyre
Club Retro Rides Member 160
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Oct 18, 2018 13:10:02 GMT
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That’s the minefield I’ve no idea what the GVW/axle weights are for a Rascal either - and coincidentally what the rating of available tyres is either. It’s also (as I said) what the VIN plate says in terms of the axle weight (what it can theoretically carry) as opposed to what the intended use actually is. Yes, but the chances of what the VIN says with regards to what actual tyres are fitted is not likely to become an issue. Think of all the Vivaro vans running around on BMW wheels with BMW tyres that are not even close to being suitable for commercial vehicle use. That is far worse than the OP putting tyres suitable for an Austin Mini on something that weighs about the same as an Austin Mini. If the OP INTENDS to use it to it's maximum plated capacity then indeed I agree with you 100%, the correct load rated tyres would be sensible. If we all stuck to doing exactly what the original manufacturer intended this would be a pretty plain ol' forum though! |
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Last Edit: Oct 18, 2018 13:10:58 GMT by Rich
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Ryannn
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Oct 19, 2018 16:57:45 GMT
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Basically as above yes guys! Haha
It’s far cheaper to put car tyres on it. It does about 15 miles a week! Haha
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Oct 22, 2018 22:48:38 GMT
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I've been down this route, car tyres on a commercial are only permissible IF they are load rated to the maximum axle rating possible with a fully loaded vehicle.
Otherwise its an MOT fail and being bent over with a fine for using an illegal tyre (not the right wording but its treated as if it were bald with the cords sticking out) if you happen to get a pull from the police/ VOSA/ DVSA whatever.
You can do a voluntary down plate to reduce your max axle weights etc but thats even more involved than just using the correct tyres.
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