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#1
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Conti Ultrasport tyres a bit squirmy?
Just got a new set of tyres on the commuter (thanks Probikekit... only
4 days!) As per standard practice, I bought the bottom-end of the price range and ended up with a pair of folding conti ultrasports (23C). Putting them on had me a little worried, as I had to be careful to get the bead seated properly; I've never had that problem with wire-bead tyres (first time I've used folding). On the ride in this morning, they certainly felt different. Very plush ride compared to my previous gatorskin/rubino combo, which I was surprised at. One slightly disconcerting thing is the way they handle.. they feel a little squirmish in the corners... a sort-of early turn-in understeer. Is this sort of handling difference normal.. or have I just pumped them up to a different pressure? duncan |
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#2
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Conti Ultrasport tyres a bit squirmy?
Duncan wrote:
Just got a new set of tyres on the commuter (thanks Probikekit... only 4 days!) As per standard practice, I bought the bottom-end of the price range and ended up with a pair of folding conti ultrasports (23C). Putting them on had me a little worried, as I had to be careful to get the bead seated properly; I've never had that problem with wire-bead tyres (first time I've used folding). On the ride in this morning, they certainly felt different. Very plush ride compared to my previous gatorskin/rubino combo, which I was surprised at. One slightly disconcerting thing is the way they handle.. they feel a little squirmish in the corners... a sort-of early turn-in understeer. Is this sort of handling difference normal.. or have I just pumped them up to a different pressure? duncan I had just put these tyres on when I had my Big Stack(TM) in the wet. Blamed it on all sorts of things before I realised it was just my acceleration out of the corner that did it. It felt about the same as my prev tyres... maybe it's just a narrower tyre? Tam |
#3
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Conti Ultrasport tyres a bit squirmy?
Tamyka Bell wrote:
Duncan wrote: Just got a new set of tyres on the commuter (thanks Probikekit... only 4 days!) As per standard practice, I bought the bottom-end of the price range and ended up with a pair of folding conti ultrasports (23C). Putting them on had me a little worried, as I had to be careful to get the bead seated properly; I've never had that problem with wire-bead tyres (first time I've used folding). On the ride in this morning, they certainly felt different. Very plush ride compared to my previous gatorskin/rubino combo, which I was surprised at. One slightly disconcerting thing is the way they handle.. they feel a little squirmish in the corners... a sort-of early turn-in understeer. Is this sort of handling difference normal.. or have I just pumped them up to a different pressure? I had just put these tyres on when I had my Big Stack(TM) in the wet. Blamed it on all sorts of things before I realised it was just my acceleration out of the corner that did it. It felt about the same as my prev tyres... maybe it's just a narrower tyre? inhale i've got these squirmy little geezers on my ride. the do suck rather badly in the wet. i've had a couple of big slides recently, like last nights big electric thunderstorm! also the places where i have issues with traction is also dodgy bitumen + sand etc no issues on concrete. ie, traction issues seem to be surface related. however in the dry they are great =) no complaints there. i run mine at 110-130psi. have handy floor pump i'm a fat barstard so 120psi for 115kg is about fair. in summer i can lay the bike right over, but in winter traction isn't there. hmm .. i'm not sure if cold vs warm is a factor.. anyone have any experience with that? i do drop the pressure when i know its going to be wet.to about 85-95psi. this may or may not make any difference for light riders. i've found it to be consistently better in the wet, but i'm not going as fast. and yes it does understeer and oversteer, its an issue of uninflated tyres. this is why i comtenplated the 26" bike and phats, but cost was out of reach. i carry less when its wet or raining, take less risky routes and ride slower... IIRR, sheldon brown says inflate you tyres, in PSI, to your weight in KG + 10. ie, if you weigh 85 kg, inflate to 95 PSI. however this does depend on the tyre type and use... i'm not sure how this applies on 26" phats tho... higher rated rim, tube and tyre? depends on the cost i suppose. and breathe cheers, kim |
#4
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Conti Ultrasport tyres a bit squirmy?
"Kim Hawtin" wrote in message ...
IIRR, sheldon brown says inflate you tyres, in PSI, to your weight in KG + 10. ie, if you weigh 85 kg, inflate to 95 PSI. however this does depend on the tyre type and use... Crikey... I wouldn't dare follow that, I'd worry that the rubber would fold over and rip from the rim.. I'm a fan of 120psi on the roadie, 100 on the mtb with slicks.. You guys all wearing "Mortal Kombat" tshirts at work now Kim? cheers, GPL |
#5
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Conti Ultrasport tyres a bit squirmy?
GPLama Wrote: "Kim Hawtin" wrote in message ... IIRR, sheldon brown says inflate you tyres, in PSI, to your weight in KG + 10. ie, if you weigh 85 kg, inflate to 95 PSI. however this does depend on the tyre type and use... Crikey... I wouldn't dare follow that, I'd worry that the rubber would fold over and rip from the rim.. I'm a fan of 120psi on the roadie, 100 on the mtb with slicks.. You guys all wearing "Mortal Kombat" tshirts at work now Kim? cheers, GPL I find that different tyres have different feel that may be different to there stickiness, something like my training tyres conti - gatorskins, do fine at 100 psi and feel solid, but michelin prorace tyres feel squishy and need at least 120 psi, I think that 100 they are fine gripo wise but the feel is disturbing. So if the new tyres are lighter/less stiff in the sidewalls, may be having this type of effect. -- PiledHigher |
#6
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Conti Ultrasport tyres a bit squirmy?
PiledHigher wrote: I find that different tyres have different feel that may be different to there stickiness, something like my training tyres conti - gatorskins, do fine at 100 psi and feel solid, but michelin prorace tyres feel squishy and need at least 120 psi, I think that 100 they are fine gripo wise but the feel is disturbing. So if the new tyres are lighter/less stiff in the sidewalls, may be having this type of effect. this sounds like a more likely scenario.. I'll pump them up some more this arvo before going home and see what happens. duncan |
#7
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Conti Ultrasport tyres a bit squirmy?
GPLama wrote:
"Kim Hawtin" wrote in message ... IIRR, sheldon brown says inflate you tyres, in PSI, to your weight in KG + 10. ie, if you weigh 85 kg, inflate to 95 PSI. however this does depend on the tyre type and use... Crikey... I wouldn't dare follow that, I'd worry that the rubber would fold over and rip from the rim.. i take it you're a lot lighter than 115kgs? =) I'm a fan of 120psi on the roadie, 100 on the mtb with slicks.. yeah me too. i've always "over inflated" my mtb tyres to get that feeling you actually have tyres under you i've finally got my SO to ride =D so more outlay on bikage is not far off! =D shes in need of mtb tyres rated to 100 psi too! the rolling resistance on our current bike is awful =/ all in good time! You guys all wearing "Mortal Kombat" tshirts at work now Kim? hardly. we're working on our own interesting thing. hmm, maybe i should ask cheers, Kim |
#8
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Conti Ultrasport tyres a bit squirmy?
"Kim Hawtin" wrote in message ...
Crikey... I wouldn't dare follow that, I'd worry that the rubber would fold over and rip from the rim.. i take it you're a lot lighter than 115kgs? =) For now yep.. I'm a fan of 120psi on the roadie, 100 on the mtb with slicks.. yeah me too. i've always "over inflated" my mtb tyres to get that feeling you actually have tyres under you i've finally got my SO to ride =D so more outlay on bikage is not far off! =D shes in need of mtb tyres rated to 100 psi too! the rolling resistance on our current bike is awful =/ all in good time! I use IRC metro 1.5's on the MTB when the weather is a little less 'damp'... they run nice at 100-110 PSI on the MTB, though they are very weighty.. I get the same speeds on some super light knobbies, pity about the cornering.. oh, I never ride my MTB off road, it is purely for looks/training cheers, GPL |
#9
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Conti Ultrasport tyres a bit squirmy?
GPLama wrote:
"Kim Hawtin" wrote in message ... i take it you're a lot lighter than 115kgs? =) For now yep.. i'm aiming for 100Kgs =) getting there slowly... I'm a fan of 120psi on the roadie, 100 on the mtb with slicks.. yeah me too. i've always "over inflated" my mtb tyres to get that feeling you actually have tyres under you that fluffy vague feeling leads to pinch flats! =( i'm in need of mtb tyres rated to 100 psi too! the rolling resistance on our current bike is awful =/ all in good time! I use IRC metro 1.5's on the MTB when the weather is a little less 'damp'... they run nice at 100-110 PSI on the MTB, though they are very weighty.. I i'm heading in the same direction myself. my curent ones max limit is 60psi, feels good at 75-80 but i've dropped it back to 65 for now, feels heavy but rides ok. get the same speeds on some super light knobbies, pity about the cornering.. oh, I never ride my MTB off road, it is purely for looks/training cornering on knobblies has always been my least favourite manouver, especially in the wet! cheers, kim |
#10
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Conti Ultrasport tyres a bit squirmy?
On 29 Aug 2005 17:33:00 -0700, Duncan wrote:
Is this sort of handling difference normal.. or have I just pumped them up to a different pressure? IME width and pressure make far more difference to the feel of a road tyre than anything else. I'd be surprised if any 23mm tyre at 120psi felt 'plush'. -- Home page: http://members.westnet.com.au/mvw |
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