|Tire wear question||Juniorgriff|
Aug 19, 2003 1:37 PM
|I am a relatively new cyclist. I recently started going on longer rides and this morning I noticed that there seems to be a flat strip wearing into my tire. I am a heavier rider (~200 lbs) and I inflate to 120psi before every ride. The tires are Continental Grand Prix 3000 and have about 750 miles on them. Is this type of tire wear normal or is there something else going on here. I know I need to lose a few pounds, but I didn't think my weight would be this much of a factor.|
|nope.......just normal wear....||Creaky Carnivore|
Aug 19, 2003 1:47 PM
|You can normally expect to get about 1k mi on an average new tire, depending on the brand/type. Conti's wear well, but the flat strip will add rolling resistance and slow you down a bit. That isn't usually a big deal if you are cycling recreationally. To gain more life from tires I usually switch the front and rear, and run them until the sidewalls get crumbly, or until there are lots of cuts in the rear tread.|
|re: Tire wear question||shakyfish|
Aug 19, 2003 2:09 PM
|I had the same issue with the Conti. GP3000. I only got about 500 miles out of mine when the rear tire got too bad to continue use. It started getting the flat spot with only 100 miles on the tire. I rotated the tires and did not have the issue with the other tire. This was on a new bike so I talked to the LBS and they contacted Trek-Lemond who in turn contacted Conti. They replaced the tire and said it was defective. Chances are you may have a bad one from the same lot??? I had only one bad wearing tire out of the set so it was definitely the tire. I do not have the same issue with the replacement either.
I highly suggest rotating tires depending on your weight and the tire about every 300 miles or so.
Try to follow up with Conti. You may get lucky. They didn't give any hassle at all with switching out my tire.
|Sounds like normal wear to me, too. But how about...||Silverback|
Aug 19, 2003 2:21 PM
|If you're running what seems to be the standard tire these days, around 700x23, you might consider switching to a 25 or 28. I have about 25 pounds on you, and I've never looked back since I switched to 700x32s @ ~100psi four or five years ago. I can't feel any increased rolling resistance, it's much more comfortable and the tires last half again as long.|
Aug 19, 2003 4:00 PM
|I get 1500 miles on a set of tires without rotating and a flat running surface on the rear at about 500 miles. If you get a nasty gouge deflate the tire and put a drop of super glue in it. My tire testing lately has been the Vredstein Fortezza. So far so good at 1000 miles.|
|A flat center is not a worn out tire!||Kerry Irons|
Aug 19, 2003 5:14 PM
|With your relatively high pressures and 200 lb. weight, you're going to see the flat spot phenomenon sooner than a lighter rider or someone riding at lower pressures. However, this doesn't mean your tire is worn out, nor does it bode either a noticeable increase in rolling resistance or changes in handling. You'll likely get around 1500 miles on one of these tires (on the rear) before you start to see casing threads coming through. That's when I replace my tires. YMMV.|
|A flat center is not a worn out tire!||zero85ZEN|
Aug 19, 2003 6:58 PM
|In fact a flat center most certainly will affect handling. Try this. Go out and ride your severly worn flat center tires for a few miles at the psi that you usually ride. Come home and immediatly switch to a new pair of the same model tire, same psi and go out and ride the same route you just rode on the old tires. It will be a difference of night and day.
That being said, I usually ride my tires down pretty low on tread and the center tread always eventually flatens out. You can get a lot of life out of a tire that is very worn as long as there are no major cuts in the casing. But definitly be aware that worn out "flat center" tires DO affect how the bike handles and noticably affects the ride feel.
|I believe this is not true...||Fez|
Aug 19, 2003 7:10 PM
|You state that worn flat center tires affect bike handling and ride feel.
I would disagree for the most part. The contact patch of the brand new and old tire is the same due to deflection of the tire under the weight of you and the bike at the stated PSI.
Now, assuming these tires are slicks and you are riding on a dry flat road, you really shouldn't feel a difference since the contact patch would be nearly identical on both.
The only possible differences you might feel between new and old tires are:
1) If the new tire had tread and the old one originally had the same tread, but was nearly bald (you still probably couldn't, especially on a flat dry section of road).
2) If the new tire had lots of rubber thickness in the center and the old one was so worn that it barely had any rubber and the casing was about to show. Its possible the ride would be a little harsher.
3) Cornering may be affected if you try to transition from going straight to a turn. The flat spot may make for some cornering problems.
|re: Tire wear question||bimini|
Aug 20, 2003 5:56 AM
|I no longer use Conti GP3000 for that very reason. They get the flat spot very quickly. I keep running them until there is no tread, but this seems dangerous (but at $40 each I am too chheap to get new tires every month). I do not race with them anymore.
I have switched to Verdenstein Tri Comps. I am happy with the wear on these. I have had them for two months and they do not have flat spots. I also like running the tire pressure up to 140-150 for racing or when I am just measuring myself against the clock. The tires are rated at 145 psi. The Verdenstein 23 cm also seems a little narrower and smaller than the contis. I am 180 lbs and the higher pressure compensates for the smaller tire. They just seem faster to me, I do not know this for sure.