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Motorcycle Forum / Country Specific / UK Group / August 2007Tyres... again!
My Trumpet is supposed to have 170/60ZR17 on the arse end. Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower profile. By my checking, there is very little in it. I'd appreciate the input from you clever lot. Oh, I'm looking at Avon Storms. TIA.  SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk > My Trumpet is supposed to have 170/60ZR17 on the arse end. > Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower > profile. By my checking, there is very little in it. What outcome do you expect from this? If it's a recommended fit, fine, but if you're doing unofficial chassis development work, you may need to let your insco know. > I'd appreciate the input from you clever lot. This lot? Be serious. > Oh, I'm looking at Avon Storms. The Severn Bore might be more interesting. Signatureplatypus somewhere to go for the night >> My Trumpet is supposed to have 170/60ZR17 on the arse end. >> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 11 lines] > > The Severn Bore might be more interesting. The Severn Bore is very interesting if you are surfing and quite interesting if you are watching people surfing, especially when they take the inside line on corners and get trashed or stuck in trees. As for tyres, Avon says a 180 needs a 5.5" or 6" rim so the OP needs to check his wheel size before deciding that the original size is best. SignatureEiron. >>> My Trumpet is supposed to have 170/60ZR17 on the arse end. >>> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 20 lines] > check > his wheel size before deciding that the original size is best. IIRC rim is 5.5". But I'll double check now. SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk >> My Trumpet is supposed to have 170/60ZR17 on the arse end. >> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 7 lines] > > This lot? Be serious. On ukrm? is anybody serious? :o) >> Oh, I'm looking at Avon Storms. > > The Severn Bore might be more interesting. Good point, I'll pop over and have a look. When's the one due along? SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk > My Trumpet is supposed to have 170/60ZR17 on the arse end. > Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower > profile. By my checking, there is very little in it. > I'd appreciate the input from you clever lot. Assuming the rubber even goes on the rim the rear will have a 3mm shorter sidewall, so the bike will be geared down very slightly, and the steering angle will be slightly increased potentially slowing the steering. No f.cking idea if it'd actually do anything *noticable* to the handling, but that's the measurable difference. >> My Trumpet is supposed to have 170/60ZR17 on the arse end. >> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 5 lines] >steering angle will be slightly increased potentially slowing the >steering. 3mm is hardly going to make much difference to the steering angle, is it? >No f.cking idea if it'd actually do anything *noticable* to the >handling, but that's the measurable difference. Seems to me that fitting the wrong tyre will have more affect the handling than a minute change in SA, no doubt about that. I suspect that putting a wide tyre on a narrow rim is going to make the actual profile a little sharper than if it were on the right rim. What this does to the handling will depend on whether the new profile is flatter, rounder or even exactly the same as the one it replaces and way the design of the tyre allows for the stresses not designed into it to be distributed. On the whole I think it is a bad idea, riding gods may have different opinions. Signaturesteve auvache A Bloo one with built in safety features > 3mm is hardly going to make much difference to the steering angle, is > it? In itself, no. But remember, that's unloaded, on a wider tire, so it'll probably compress more.. but erm wibble flip dibble do. >>> My Trumpet is supposed to have 170/60ZR17 on the arse end. >>> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 21 lines] > On the whole I think it is a bad idea, riding gods may have different > opinions. Noted. SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk >> My Trumpet is supposed to have 170/60ZR17 on the arse end. >> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 8 lines] > No f.cking idea if it'd actually do anything *noticable* to the > handling, but that's the measurable difference. That's more or less how I looked at it. No reason to think the it wouldn't fit though? SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk > That's more or less how I looked at it. > No reason to think the it wouldn't fit though? That all depends on the rim size, ytc. Find out how wide the rim is, then check with thetyre manufacturer's web sit what range of witdths the tyre you want actually fits on > >> That's more or less how I looked at it. [quoted text clipped - 3 lines] > then check with thetyre manufacturer's web sit what range of witdths the > tyre you want actually fits on Is that a Ginge? We discussed all this last night. SignatureEiron. > My Trumpet is supposed to have 170/60ZR17 on the arse end. > Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower > profile. By my checking, there is very little in it. > I'd appreciate the input from you clever lot. Chances are you'll sod up the steering. Make it slower to turn. 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..... >> My Trumpet is supposed to have 170/60ZR17 on the arse end. >> Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower >> profile. By my checking, there is very little in it. >> I'd appreciate the input from you clever lot. > > Chances are you'll sod up the steering. Make it slower to turn. The way I go round corners nowadays, I doubt it would make any difference ;o) SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk >My Trumpet is supposed to have 170/60ZR17 on the arse end. >Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower >profile. I've told this story before, but as it is relevant, I'll go again: I have an RF900, which takes a 170 rear tyre. The Bandit 12 uses the same rear wheel, but takes a 180 rear tyre. The RF, not the finest handling bike in the world, can be persuaded around corners at a reasonable rate by hanging off a bit, and gassing it right at the apex. I put the Bandit wheel, with its 180 tyre on the RF. What a f.cking disaster - it /would not/ turn in to corners, it didn't want to do sweepers. It wanted to sit upright for the rest of its life and never be leaned over again. Me and it got up close and personal so often with local grass verges that we were on first name terms. In short the handling went from 7/10 to 3/10, but was instantly restored to its previous score when the original wheel and 170 tyre were refitted. Nutshell - don't do it. SignaturePip: B12 >>My Trumpet is supposed to have 170/60ZR17 on the arse end. >>Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower [quoted text clipped - 16 lines] > > Nutshell - don't do it. Noted. I've since been told by some of the Triumph chaps, that putting the 18 tyre on makes no difference to the handling. Apparently, the Daytona uses the 180 over the 170. I'll find out in the future when I fir the 180 I've bought. If I don't like it it'll be back to 170 pronot. Thanks for the input. SignatureGreybeard FLHTCUI UK-07 Mk II (Sold) Trumpet Trophy 1200-03 Garmin Zumo 550, To get me home! ukrm@foxtails[dot]co[dot]uk >>My Trumpet is supposed to have 170/60ZR17 on the arse end. >>Can I fit, 180/55ZR17 instead? I fancy the wider tyre with the lower >>profile. > >I've told this story before, but as it is relevant, I'll go again: I >have an RF900, which takes a 170 rear tyre. Blimey. >The Bandit 12 uses the >same rear wheel, but takes a 180 rear tyre. The RF, not the finest [quoted text clipped - 11 lines] > >Nutshell - don't do it. I deeply regret not trying a 180 on my TLR for the same reason: it took a hefty lean on the bars to turn on the stock 190 and it just felt wrong in the wet. Signature-Pip > I deeply regret not trying a 180 on my TLR for the same reason: it > took a hefty lean on the bars to turn on the stock 190 and it just > felt wrong in the wet. Putting a 180 on my 7R turned it from a slow steering but sure footed handler to a slow and understeering slightly evil handler. The reason I tried it was because 'everyone' said that "that's what the racers do to speed up the steering". It was only afterwards that it occurred to me that "the racers" were using slicks front and rear, which would bear little resemblance to whatever you'd buy for the road. I think the basic point about the TLR is that (like the 7R) it's a lardy, top heavy, long wheel base, barge. Changing a tyre size is most unlikely to make it better. |
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