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Interesting.
I think Conti has maybe made some changes to their site. There's now a 'Road and Track' section which when you click into it has options for 'Clincher' or 'Tubular'. I don't think it used to be like that.
The charts which have a 'track/indoor' section for tubs but not clinchers are still the same though. These obviously pre-date the GP Supersonic (which imo looks to be the more track suitable tyre) as it isn't on the clincher one.
When you click into the GP Supersonic it does say "This tyre is intended for race use only in solo events on the road or as an all-round track clincher (indoor & outdoor), and is not recommended for road races or training rides due to its short tread life."
The GP5000 does not mention track.
I kind of wish they'd just remove the charts, they are out of date anyway and the opinion at Glasgow at least is that by having a 'track/indoor' section on the tub one but not the clincher one, they are as good as saying "We don't make track suitable clinchers."
For what it's worth, the hire bikes at Lee Valley have Conti GP5000 clinchers...
My son thinks they grip better than the Veloflex Record tubs I have on my track bike. (He's ridden both and felt like my tubs were slipping down when going slow round the banking).