According to Veloflex you can expect 2.500km when used on a rear wheel and twice as much when mounted on a frontwheel.
This estimate assumes competition use.
Personally I have a Extreme on the frontwheel which has seen the better part of 8.000 km and it shows no signs of wear whatsoever. No competition though.
The disturbing thing is that until that point I did probably between 1.000 and 1.500kms of racing and Im not a big guy at 66kgs.
I did like the Extreme and I will probably use them again next year but the Carbon used to last much much longer.
Carbon and Criterium will be more durable, so consider what timespan between gluing sessions you consider acceptable.
Factor that into your decision before using the Extreme for any purpose other than special occasions (e.g., races, quality time with the machine, your most important group training, and shameless bike-porn photos for the Gallery forum).
Great tyre, I would fully recommend it unless you're one of these wide rim converts, as they are pretty narrow
So OP, as between the Extreme and Carbon only, I've never felt any appreciable difference. A quick pothole and they're both gone.
In general, I have found that Veloflex clinchers and tubulars have far shorter service lives than the factory estimates. At 57kg, I'm not pushing the weight limits of any equipment on my bike, tires included, but I've found that their rubber is good for about 60-75% of the estimated "lifespan" before visible tread degradation, cuts, and puncture vulnerability become unacceptable.
Not wanting to sound like a broken record but you should be able to get about at twice as much as the expected mileage announced by the manufacturer if you'd age them properly.
Of course riding style and the idiosyncracies of the geograpical location where they're used is a factor as well but still. All in all I find the manufacturer's estimations very much erring on the conservative side.
No need to rotate tyres when using tubulars (it is too much hassle doing more damage than good), just retire the rear one when needed and replace by a "fresh" one.
Where I ride I just can't use Vittorias as they just puncture regardless of age and abuse due to them having this nasty propensity to burry small flints inside the tread.
Just for the record, I hardly ever puncture Veloflex tyres. No more or less than I would say a Conti Comp anyway...
2016 Cannondale EVO Etap 13.8#'s
2012 Cannondale Supersix EVO etap 13.7#'s
2017 Cannondale SUPER X Force 16.0#'s
2016 Cannondale FatCad2 28.1#'s
2011 Cannondale Carbon Flash 1 17.9#'s
Sometimes, you also need options that *just work*, and the fact is that running Extremes while expecting GP4000/Gatorskin durability is unrealistic. Also, FD, I know you keep a huge, slow-moving assembly line of aging Veloflex tubs for your wheels, but maintaining an arsenal of tires simply to overcome their inherent vulnerabilities isn't always practical. I think the OP is looking for tires that arrive ready to use from the factory.
I do agree that rotating tubulars front-to-rear isn't a sound practice. That's a good point, and the risk of damage outweighs the limited advantages. This practice is best restricted to clinchers.
I have noted that Veloflex clinchers also ride nicely, but they have the same proclivity to wear quickly and flat frequently once they reach a worn state. Surely, you can't expect people to age clinchers too... ?
Veloflex remains my go-to for fine rubber, but I accept their limits and plan accordingly. Maybe the OP just wants to compare one Veloflex to another, so that's cool. Gatorskins are always there if you need 'em.
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