If your thinking of buying those tires there are a few things you need to consider. First and formost where do you live and what is the cross like in your region. If you live in the Rocky mountains or any where that is prone to thorns/has really rocky courses stay clear of that tire and get tufo's. But if you live in some place where the courses are more manicured and european style (eastcoast, northwest) then go with the challenge. To be honest the challenge is a far suppirior tire. Cross has more to do with tire pressure and suppleness than with tread. The tread is not large enough to make a huge difference. That said the challenge is far more supple and rides better than any tufo. I would highly recomend them if you are doing any seriouse racing. I just got back from 7 weeks in europe and lots of the pros even run the challenge, although not as many as those running dugasts.crossbishop said:I'm making the move to tubulars. I saw on cyclocrossworld that Challenge Grifo 32's are on sale for $69. Anyone have any feedback on these? Would I be better off spending the extra coin on Tufo Flexus'? Input appreciated. Thanks.
Sorry, haven't used the new grifo except once at nats (day 2) and can't comment on their durability. The new ones have additional side knobs which is a big improvement. I've had great luck for the most part with older grifos and particularly with Dugasts this year, Barb and I basically shared 3 pairs this year and had zero flats (that probably comes to 20 or so races per pair!).euro-trash said:maybe wunlap can chime in here. This year Grifos went to a different 'finish' on their sidewalls. It looks like a superthin layer of latex. Did that help sidewall durability? I had good luck with the older type, hopefully these are even better. I'm due for new rubber.