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Post by martin on Oct 11, 2023 20:34:40 GMT
I know these tyres are past it and will be replaced. Are they tubed or tubeless? If they do have tubes is it possible to replace them with tubeless? What's the thoughts on best replacements? Thanks folks.
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Post by BritPete on Oct 11, 2023 20:41:12 GMT
They have a nut on the valve so they have a tube
Tubeless ones will have a rubber on the valve like a car
I think the early comstars were tubed- the reverse comstars were tubeless
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Post by davefirestorm on Oct 11, 2023 21:13:37 GMT
The Comstar wheel is a composite motorcycle wheel that Honda fitted to many of its motorcycles from 1977 to the mid 1980s. Its design allowed it the option of being fitted with tubeless tyres and its use on the Honda CX500 was the first time tubeless tyres had been designed for a production motorcycle. BP is correct regards your tubed tyres 👍
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Post by joesoap on Oct 11, 2023 23:06:30 GMT
Normally a tyre will state either TT or TL on the side wall somewhere. TT = tube type, TL = tube less. My understanding is that the reverse comstars from 81 were tubeless and all other standard comstar tube type.....but that of course would not stop folks fitting either to either I suppose.....I have seen it.
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Post by johnfcbn44dx on Oct 12, 2023 10:00:44 GMT
If you fit a tube into a tubeless tyre, the issue is potential rubbing of the tube on a potentially rougher tyre internal surface and heat build up. But unlikely to be an issue on a 250 Superdream. The speed rating of the tyre would no longer be applicable but general I presume a V or H rated Tyre would still meet the "S" rating of the SD. If I were in a shop comparing a TL tyre selection to be tubed, I would pick the one with the smoothest internal carcass. The Avon rep confirmed (8? years ago)the AM26 road rider was ok for a tube inside. Some old conti tyre info, suggested recommended not to exceed 131kph/82mph again not a worry for an 250 SD. I like the roadriders AM26 now (early ones had some compound cracking issues). Most of the tyres suitable are still crossply, the Bridgestone Battleaxe BT45s were/are Bias Belt construction. metric 100/90 or 80 x 18 on the back (the largest for the MT1.85 RIMS, 90/90 x19 front Speed rating "s" or greater. (the reverse comstars have a wider MT2.15 which can take a TL 110/80 x 18 on the rear)
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Post by martin on Oct 12, 2023 15:41:21 GMT
They have a nut on the valve so they have a tube Tubeless ones will have a rubber on the valve like a car I think the early comstars were tubed- the reverse comstars were tubeless
Thanks Pete now that it's pointed out, quite obvious ain't it.
Well they're holding air so tubes must be sound.
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Post by martin on Oct 12, 2023 15:51:31 GMT
The Comstar wheel is a composite motorcycle wheel that Honda fitted to many of its motorcycles from 1977 to the mid 1980s. Its design allowed it the option of being fitted with tubeless tyres and its use on the Honda CX500 was the first time tubeless tyres had been designed for a production motorcycle. BP is correct regards your tubed tyres 👍 Thanks Dave. I remember having my first 125, a DT, with a ridiculously buckled rear wheel that I spent as much time fixing punctures on than riding it.
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Post by martin on Oct 12, 2023 15:55:47 GMT
Normally a tyre will state either TT or TL on the side wall somewhere. TT = tube type, TL = tube less. My understanding is that the reverse comstars from 81 were tubeless and all other standard comstar tube type.....but that of course would not stop folks fitting either to either I suppose.....I have seen it. Thanks Joe. That's easy to look out for now.
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Post by martin on Oct 12, 2023 15:58:12 GMT
If you fit a tube into a tubeless tyre, the issue is potential rubbing of the tube on a potentially rougher tyre internal surface and heat build up. But unlikely to be an issue on a 250 Superdream. The speed rating of the tyre would no longer be applicable but general I presume a V or H rated Tyre would still meet the "S" rating of the SD. If I were in a shop comparing a TL tyre selection to be tubed, I would pick the one with the smoothest internal carcass. The Avon rep confirmed (8? years ago)the AM26 road rider was ok for a tube inside. Some old conti tyre info, suggested recommended not to exceed 131kph/82mph again not a worry for an 250 SD. I like the roadriders AM26 now (early ones had some compound cracking issues). Most of the tyres suitable are still crossply, the Bridgestone Battleaxe BT45s were/are Bias Belt construction. metric 100/90 or 80 x 18 on the back (the largest for the MT1.85 RIMS, 90/90 x19 front Speed rating "s" or greater. (the reverse comstars have a wider MT2.15 which can take a TL 110/80 x 18 on the rear) Thanks John that's excellent info, broadens the selection when it come to find a couple tyres.
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Post by Rossco on Nov 10, 2023 0:16:03 GMT
They have a nut on the valve so they have a tube Well now I don't know what to think. I sourced some gold Reverse Comstars locally because my '78 currently wears original silver Tubed wheels. The gold ones are stamped "Tubless Tire Applicable" and have a nut. No rubber. Ow my brain.
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Post by BritPete on Nov 10, 2023 7:56:51 GMT
They have a nut on the valve so they have a tube Well now I don't know what to think. I sourced some gold Reverse Comstars locally because my '78 currently wears original silver Tubed wheels. The gold ones are stamped "Tubless Tire Applicable" and have a nut. No rubber. Ow my brain. Not uncommon When I put new tyres on MKW which had Gold tubeless rims I wanted period looking tyres, I choose Dunlop TT100s which are tubed tyres You can put tubes and tubed tyres on a tubeless rim but you cannot put tubeless tyres on rim designed for tubes
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Post by Rossco on Nov 10, 2023 8:06:56 GMT
You can put tubes and tubed tyres on a tubeless rim but you cannot put tubeless tyres on rim designed for tubes Of course. I failed to comprehend the basis of that statement. Long story short I need to buy a couple of valve stems. Got it 👍
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