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Motorcycle Forum / Country Specific / UK Group / August 2007Tyres: x-ply v radial
A bloke here has a Pan and says it's got a Bridgestone Excedra on the front which he thinks is a x-ply. He wants a new rear but is concerned about putting a radial on. Are our modern tyres all radials now? And can he safely mix a radial rear with a x-ply front?  SignaturePaul. CBR1100XX SuperBlackbird (Buen mueble de patio) And a pushbike of some sort. BOTAFOT #4 BOTAFOF #30 MRO #24 OMF #15 UKRMMA #30 > A bloke here has a Pan and says it's got a Bridgestone Excedra on the > front which he thinks is a x-ply. He wants a new rear but is concerned > about putting a radial on. Are our modern tyres all radials now? And can > he safely mix a radial rear with a x-ply front? If by 'modern' you mean 'big tyres for modern superbikes', then I think they're all radial, yes. There are still loads of crossplies for bikes that don't need low-profile wide tyres (like my BMW). And it's illegal to mix radial and crossply, although I can't see what the problem is on a bike. TOG@toil wrote: > And it's illegal to mix radial and crossply, although I can't see what > the problem is on a bike. I thought that only applied to tyres on the same "axle"? Ah, google throws up a couple of hits that say it's also illegal to have radial front and crossply rear, though that's not from primary legal sources [1] so should be treated with caution. [1] though it cites Road Vehicles (Construction & Use) Regulations 1986 regulation 26 SignatureRick NT650V (still) TWA#11 BREast#6 BOTAFOT#139 > TOG@toil wrote: >> And it's illegal to mix radial and crossply, although I can't see what [quoted text clipped - 5 lines] > radial front and crossply rear, though that's not from primary legal > sources [1] so should be treated with caution. This backs up my understanding. I can still remember the governmebt TV adverts featuring, IIRC an Austin 1100 just like my dad's that and that ex Met Chief Constable. He also featured in the Goodyear adverts of the same era, c1970. >> TOG@toil wrote: >>> And it's illegal to mix radial and crossply, although I can't see what [quoted text clipped - 9 lines] > Met Chief Constable. He also featured in the Goodyear adverts of the same > era, c1970. Go like that on a public highway, you deserve to be called a raving maniac. 25 years I've been in the police force, and I have *never*....... SignatureCatman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 156 TS 166 V6 2.5 145 2.0 Cloverleaf 156 V6 2.5 S2 Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk > > TOG@toil wrote: > >> And it's illegal to mix radial and crossply, although I can't see what [quoted text clipped - 10 lines] > Met Chief Constable. He also featured in the Goodyear adverts of the same > era, c1970. Sir Robert Mark?, he of "if you drove like that on the road ..." fame? Only that was a *lot* later, c1980. Spookily, I was watching some NTNON DVDs last night, and they included the hugely funny sketch in which GRJ took him off to a tee. SignatureBear > Sir Robert Mark?, he of "if you drove like that on the road ..." fame? > Only that was a *lot* later, c1980. That's the badger. Thinking about it, it was early 80s as I put a set of those Goodyears on my first car. Probably doubled the value of the car! > TOG@toil wrote: > [quoted text clipped - 6 lines] > radial front and crossply rear, though that's not from primary legal > sources [1] so should be treated with caution. I wasn't asking about legalities though (I live in a different country to you lot), rather safety/integrity ie; should he do it? SignaturePaul. CBR1100XX SuperBlackbird (Buen mueble de patio) And a pushbike of some sort. BOTAFOT #4 BOTAFOF #30 MRO #24 OMF #15 UKRMMA #30 >> TOG@toil wrote: >> [quoted text clipped - 9 lines] > I wasn't asking about legalities though (I live in a different country > to you lot), rather safety/integrity ie; should he do it? Fair point, but laws like tend to come in because there's some evidence suggesting that it's a Good Idea (TM), so I'd generally take it as a "should" until I could find the reasoning behind the law. Knowing the law might help you to work back to finding that reasoning. There, I think I got out of that one without anyone noticing.... SignatureRick NT650V (still) TWA#11 BREast#6 BOTAFOT#139 > > TOG@toil wrote: > > [quoted text clipped - 9 lines] > I wasn't asking about legalities though (I live in a different country > to you lot), rather safety/integrity ie; should he do it? A Pan is a big, heavy bike. Personally, I'd politely suggest that he be less of a f.cking pikey. SignatureBear We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember TOG@toil,chateau.murray@btinternet.com, <chateau.murray@btinternet.com> saying something like: >And it's illegal to mix radial and crossply, although I can't see what >the problem is on a bike. Only on the same axle, which is only a problem on a trike. Fwiw, I've had radials on my SOBs with a x-ply front (bike fronts aren't true x-plies, afaik) and the roadholding has improved measurably. So any bike might benefit from it. Radials still exhibit a tendency to catch out the unwary, but this has been known about for 40+ years. If you're used to the gradual breakaway characteristics of a x-ply the tenacious grip of a radial then relatively sudden breakaway might be a problem if you're not fully attuned to the car/bike with them on. SignatureDave GS850x2 XS650 SE6a Teach a man to fish and he and his pikey mates will have the river cleaned out in a day. TOG@toil wrote: >> A bloke here has a Pan and says it's got a Bridgestone Excedra on the >> front which he thinks is a x-ply. He wants a new rear but is >> concerned about putting a radial on. Are our modern tyres all >> radials now? And can he safely mix a radial rear with a x-ply front? > And it's illegal to mix radial and crossply, although I can't see what > the problem is on a bike. Only on the same axle, IIRC. SignatureZX6R F2 - The Gravelseeker BOTAFOT #121, BBB #2 On 22 Aug, 17:44, "Monkey" <mon...@surfR3M0VEbum.freeserve.co.uk> wrote: > TOG@toil wrote: > >> A bloke here has a Pan and says it's got a Bridgestone Excedra on the [quoted text clipped - 5 lines] > > Only on the same axle, IIRC. Nope. See elsewhere in the thread. I remember I bought a brand new cheap tyre for my Ducati at an autojumble, and then the fitter wouldn't fit it (or something - it was a few years ago) because it was an x-ply and the other tyre was a radial. We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember TOG@toil,chateau.murray@btinternet.com, <chateau.murray@btinternet.com> saying something like: >> Only on the same axle, IIRC. > >Nope. See elsewhere in the thread. I remember I bought a brand new >cheap tyre for my Ducati at an autojumble, and then the fitter >wouldn't fit it (or something - it was a few years ago) because it was >an x-ply and the other tyre was a radial. Wouldn't fit it to where? The rear? If so, then fine. You cannot have a radial front and x-ply rear on anything. SignatureDave GS850x2 XS650 SE6a Teach a man to fish and he and his pikey mates will have the river cleaned out in a day. > A bloke here has a Pan and says it's got a Bridgestone Excedra on the > front which he thinks is a x-ply. He wants a new rear but is concerned > about putting a radial on. Are our modern tyres all radials now? And can > he safely mix a radial rear with a x-ply front? You can still buy x-ply tyres. If the bike is old, and was originally designed for x-ply, then it is generally better to stick with x-ply. This is the advice given by the FJOC, and I've had 3 different make sets radials on my FJ12, but switched to x-ply, and IMO the bike actually handles better with the x-ply SignatureRob_P UKRM(at)indqualtec.co.uk uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl) FJ1200, (in bits) CCM130 (need sharpening) Atonal apples and amplified heat available now! > In article <5j2cldF3riie...@mid.individual.net>, Paul Carmichael wrote: > > A bloke here has a Pan and says it's got a Bridgestone Excedra on the [quoted text clipped - 10 lines] > radials on my FJ12, but switched to x-ply, and IMO the bike actually > handles better with the x-ply In most cases, I think that's crap advice. If there's a radial fitment, use it. I remember a radial tyre launch some 20 years ago (Michelin), and we were all offered pairs of identical bikes: one fitted with x-plies, and one with radials, so you could hop straight off one and onto the other. You could really notice the difference. Obviously, for really old bikes, you won't be able to get radials anyway. > If the bike is old, and was originally designed for x-ply, then it is > generally better to stick with x-ply. Utter cobblers. SignatureBear > > If the bike is old, and was originally designed for x-ply, then it is > > generally better to stick with x-ply. > > Utter cobblers. Of course, Mitchelin Man SignatureRob_P UKRM(at)indqualtec.co.uk uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl) FJ1200, (in bits) CCM130 (need sharpening) Atonal apples and amplified heat available now! > > > If the bike is old, and was originally designed for x-ply, then it is > > > generally better to stick with x-ply. > > > > Utter cobblers. > > Of course, Mitchelin Man Seriously, you haven't got clue one. SignatureBear > > > If the bike is old, and was originally designed for x-ply, then it is > > > generally better to stick with x-ply. > > > > Utter cobblers. > > Of course, Mitchelin Man Michelin, YTC, and it is, indeed, bollocks. SignatureBMW K1100LT 750SS CB400F CD250 CB125 SL125 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells..... In article <1i39mng.us98f816hdh6lN% > Michelin, YTC, and it is, indeed, bollocks. <Shrug> I'm only going on my own experience - WTF do I know? SignatureRob_P UKRM(at)indqualtec.co.uk uppercase(d) BBIWYMC#1 BOG#11? MRO#31 IBCDBBB#1(kotl) FJ1200, (in bits) CCM130 (need sharpening) Atonal apples and amplified heat available now! > In article <1i39mng.us98f816hdh6lN% > > Michelin, YTC, and it is, indeed, bollocks. > > <Shrug> > I'm only going on my own experience - WTF do I know? Indeed. SignatureBMW K1100LT 750SS CB400F CD250 CB125 SL125 GAGARPHOF#30 GHPOTHUF#1 BOTAFOT#60 ANORAK#06 YTC#3 BOF#30 WUSS#5 The bells, the bells..... >> In article <1i39mng.us98f816hdh6lN% >>> Michelin, YTC, and it is, indeed, bollocks. >> <Shrug> >> I'm only going on my own experience - WTF do I know? > > Indeed. It turns out that I also knew nothing. Does my Italian classic have crossply tyres? How do I tell? So a web search revealed that the dash in 100/90-18 means it is a crossply and the R in 100/90HR18 would mean it is a radial. Does anyone know if radial tyres are available in such narrow, high profile sizes as 100/90 and 110/90? SignatureEiron. > >> In article <1i39mng.us98f816hdh6lN% > >>> Michelin, YTC, and it is, indeed, bollocks. [quoted text clipped - 10 lines] > Does anyone know if radial tyres are available in such narrow, high profile > sizes as 100/90 and 110/90? Gawd knows. I doubt it. That said, Pirelli did make early radials for the original K series BMWs (rather bigger tyres, but still fairly narrow). I think just about all SOB tyres are crossplies. > In article <1i39mng.us98f816hdh6lN% > > Michelin, YTC, and it is, indeed, bollocks. > > <Shrug> > I'm only going on my own experience - WTF do I know? f.ck all, clearly. SignatureBear > In article <1i39mng.us98f816hdh6lN% >> Michelin, YTC, and it is, indeed, bollocks. > ><Shrug> > I'm only going on my own experience - WTF do I know? A clearer example of foot/both barrels interface you would be hard pressed to find.. Phil. SignaturePhil Launchbury, IT PHB 'I'm training the bats that live in my cube to juggle mushrooms' |
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