7 of 7 customers found this review helpful.
I put two new pairs of 28mm GP 4 Season tires on our bike's to stop the flats. My wife has ridden 2981 miles on her tires and she has had just one flat. It used to be you would average (on a NEW tire) about a flat for every 1000 miles you would ride (the flats would increase with the miles on the tire). My original GP4 rear tire lasted 4814 miles with 2 flats - one was a seam leak in the tube (that's not the tire's fault) and the other one was caused by a very tiny thorn which was losing about 15 lbs of air a day. I did get all the use I could out of that tire because you could see a few little places of the white cords under the tire's flat center tread before I changed it out.
I do not rotate my tires because years ago a racer told me if you blow out the front tire you are going to go down - if it is the rear tire you can still have control and ride 'er down to a stop so always put your best tire on the front axle. So I always move the used front tire to the rear wheel and put the new tire on the front. That original front tire that went to the rear position now has two tiny places in the worn flat center that are starting to show the white cord below. That tire is about due to be replaced so I will mount the front tire on the rear wheel and put a new tire on the front wheel.
The GP4 is a directional tire -- look for the rounded D's (with the cross hatches) on the outer edge of the tread butting up to the Vectran sidewall belts. The 14 short straight side of the cross hatched slanted D's should be facing toward the FRONT of the bicycle when the tire is correctly mounted.
That original tire that is now on the back has 8358 miles on it and it has had just those two flats I mentioned earlier. Today the front tire that will eventually go to the back has 3550 miles on it with no flats and the molded center line on that tire is still just visible. Most of our riding is on chip & seal, asphalt pavement but we also will get on chat, gravel and dirt lanes, too. I ride year round so I have ridden in the snow and ice down to 5 - 10 F. At those low temperatures about an hour or so is all I want. The GP 4 Season tires are superior in wet & the wetcold environments - just gear down and always keep a bike very vertical when it is very slick out.
After EACH ride we wipe the tires tread completely down with a cloth - this pulls all the junk out of the tread. You don't get very many sharp slivers that stick in the GP4 tread, unlike many other tires with softer compounds. I weigh about 190 lbs, my wife about 135. I believe this is the best pressure for ride, handling, wear & flat resistance on the 28MM tire. On both bicycles I pump the pressure up to 6 bars (87 lbs) in the rear tire and 5 lbs less in the front tire on both bikes. I loose 5 lbs of this pressure when I remove the air chuck from the tire stem. How much pressure does your chuck loose when you remove it? Have you ever checked that? So I am running 82 psi in the rear & 77 psi in the front tire. I could & should probably run a LITTLE less pressure in my wife's tires since she is 45 lbs lighter but I just haven't done the math yet. You know - you will get a better ride but with more rolling resistance. Just like life is, it has been said you have to give up something to get something Well isn't that the truth!!!
We have ridden about every ride here in the KC Mo area with the KC Bicycle Club. Rides that were all in the city, uptown downtown with glass, grates, railroad tracks, sand & everything else those city streets have for us. And the club rides out in all the surrounding countryside with gravel, thorns, cow piles, sand & chasing dogs - you know, those rural areas. This tire just simply takes everything on while you
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