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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 03-20-11, 07:00 PM   #1
ryandd
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Conti Grand Prix 4000

As a clyde tires are an important item...really no matter what your size. When i bought my bike at the end of the 09 season i put some new tires on it and choose continnetial GP 4000....at the begining of the season i noticed what appeard to be dry rot cracks just where the tread meets the sidewall. these tires had less than 300 miles on them at that point and the nipples were still on the front tire. I was somewhat worried and took the tire off and looked on the inside and it looked good. Getting the bike ready this season and it looked worse and there are strands of what appear to be reenforcement shreading off the tire. I contacted continential last year and got no response....going to trash these tires i think .They other than this issue they have given me no issues and i really like them but am possibly gun shy on the brand especially at $140+ per pair not counting tubes. What to do? Anyone else have issues with their Conti's? Any one want to rec. a good 700x23?
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Old 03-20-11, 09:03 PM   #2
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As a clyde tires are an important item...really no matter what your size. When i bought my bike at the end of the 09 season i put some new tires on it and choose continnetial GP 4000....at the begining of the season i noticed what appeard to be dry rot cracks just where the tread meets the sidewall. these tires had less than 300 miles on them at that point and the nipples were still on the front tire. I was somewhat worried and took the tire off and looked on the inside and it looked good. Getting the bike ready this season and it looked worse and there are strands of what appear to be reenforcement shreading off the tire. I contacted continential last year and got no response....going to trash these tires i think .They other than this issue they have given me no issues and i really like them but am possibly gun shy on the brand especially at $140+ per pair not counting tubes. What to do? Anyone else have issues with their Conti's? Any one want to rec. a good 700x23?
Just because you bought new tires, doesn't mean they are fresh tires, tires begin to age the day they are manufactured, they go from manufacturer, some Conti's are made in Germany, some in Taiwan, they wait until they are sold to a distributor, then they are shipped to the distributor, they sit at the distributors until they are sold to a dealer, then shipped to that dealer, where they sit until they are sold to you. This could be anything from a couple of months to a couple of years after they are made, if at some point along the way they were improperly stored, they could crack like that, very expensive tires are more likely to sit for a while then cheaper tires. If I bought new tires in the fall and found them cracked in the spring, I would contact the dealer first, often the dealer can deal with the company. Mind you, I am unlikely to actually buy tires in the fall, unless the bike is going on the trainer, and then I'll make the old tires do for the winter. Heck, I have an old 27" wheel on the back of the road bike right now, because I have old 27" tires I want to wear out, before wasting good tires....
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Old 03-20-11, 09:34 PM   #3
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As long as the cracks are only in the rubber on the outside of the tires and not the fiber casing that is cracked you should be ok. I've ridden tires that have had the same small cracks in the rubber on the side as you discribed.
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Old 03-20-11, 11:11 PM   #4
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I love conti 4000's but they seem to square off on the rear very quickly with heavier riders.. I honestly find the Serfas Seca RS tire very comparable in performance and weight and they last longer and much more clyde friendly over time.. $58.00 per pair with free shipping is a good deal on these, they weight 215g.

http://shop.ebay.com/i.html?_nkw=ser....c0.m270.l1313
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Old 03-20-11, 11:21 PM   #5
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Originally Posted by ryandd View Post
Anyone else have issues with their Conti's? Any one want to rec. a good 700x23?
I had a Continental Gatorskin where the sidewall separated from the bead after about 1000 miles of riding. Left me stranded on a mountain road a couple of miles outside cell phone range

That said, I've owned lots of other Conti tires and never had a problem. Just installed a set of Conti GP4000s and so far I'm loving them! FWIW, I store my bikes indoors and haven't seen any problems with dry rot or cracking in any of my tires.
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Old 03-21-11, 06:12 AM   #6
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bought them last year and have been excited, best tire I've ridden
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Old 03-21-11, 06:30 AM   #7
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Originally Posted by ryandd View Post
As a clyde tires are an important item...really no matter what your size. When i bought my bike at the end of the 09 season i put some new tires on it and choose continnetial GP 4000....at the begining of the season i noticed what appeard to be dry rot cracks just where the tread meets the sidewall. these tires had less than 300 miles on them at that point and the nipples were still on the front tire. I was somewhat worried and took the tire off and looked on the inside and it looked good. Getting the bike ready this season and it looked worse and there are strands of what appear to be reenforcement shreading off the tire. I contacted continential last year and got no response....going to trash these tires i think .They other than this issue they have given me no issues and i really like them but am possibly gun shy on the brand especially at $140+ per pair not counting tubes. What to do? Anyone else have issues with their Conti's? Any one want to rec. a good 700x23?
Don't pay $140 per pair, order them from pbk for much less. Post some pics, as I ride 5-6k miles per year on Contis and have been very happy with them. Will add, that most clydes would probably be better of with 25 or even 28 if they will fit, rather then 23. Post some pics if you want.
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Old 03-21-11, 10:19 AM   #8
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Originally Posted by ryandd View Post
. . . at the end of the 09 season i put some new tires on it and choose continnetial GP 4000....at the begining of the season i noticed what appeard to be dry rot cracks just where the tread meets the sidewall. these tires had less than 300 miles on them at that point and the nipples were still on the front tire. . . .
It sounds to me like you don't have a tire problem as much as you have a storage problem - Did you happen to store your bike in a dry unheated garage during the off-season (winter)? A couple of months of below freezing temperature and below 20 % humidity will do that to the surface of your tires no matter how much you paid for them. Rubber, plastics, etc. don't last long in extreme cold/dry conditions. These are the same conditions that manufacturers use to simulate the aging process for accelerated testing.

If you want your bike to look and perform just as good on the first day of the season as it did the last day of last season - store it in climate-controlled (temperature AND humidity) environment during the off-season. Otherwise, you are just advancing the aging process of the many rubber/plastic bits on your bike.
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Old 03-21-11, 08:02 PM   #9
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I understand that leaving the bike out in the cold or hot exposures the condition of the rubber...... After posting this I did a little more research and found that others have had the same problem. See the links below. After reading these comments I am going to Absolutly replace the tires. Somenhave had sidewall splits less than one month after install FYI.... Bike is indoors in the winter and lives for the most part in the garage in the spring/summer/fall. I live in St louis so humitiy is somewhat high in the summer. another thing I didn't add was these are the GP 4000s models.

http://www.roadbikereview.com/cat/wh...2_2489crx.aspx
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Old 03-21-11, 08:34 PM   #10
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Originally Posted by hammond9705 View Post
Don't pay $140 per pair, order them from pbk for much less. Post some pics, as I ride 5-6k miles per year on Contis and have been very happy with them. Will add, that most clydes would probably be better of with 25 or even 28 if they will fit, rather then 23. Post some pics if you want.

I agree, i'm only 245 and I ride on 25's rather than 23's. everything I have read says it's all in your mind thinking that 23's are somehow faster at our weight.
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Old 03-21-11, 10:19 PM   #11
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Just curious.... Any of you guys buy tires from amazon? Curious how "fresh" Their stock is. FYI thats where the problem tires came from.
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Old 03-21-11, 10:46 PM   #12
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I have a set of the gp4000s and have not had any problem with them, I am even using one on my trainer. I can't remember where I got them, it was someplace where they were cheapest at the time. I store my bikes inside in the basement.

I have has some threads come loose on older conti's but these were old with lots of miles.
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Old 03-22-11, 06:05 AM   #13
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Originally Posted by Kylerk View Post
It sounds to me like you don't have a tire problem as much as you have a storage problem - Did you happen to store your bike in a dry unheated garage during the off-season (winter)? A couple of months of below freezing temperature and below 20 % humidity will do that to the surface of your tires no matter how much you paid for them. Rubber, plastics, etc. don't last long in extreme cold/dry conditions. These are the same conditions that manufacturers use to simulate the aging process for accelerated testing.

If you want your bike to look and perform just as good on the first day of the season as it did the last day of last season - store it in climate-controlled (temperature AND humidity) environment during the off-season. Otherwise, you are just advancing the aging process of the many rubber/plastic bits on your bike.
Yet the Ritchey Tom Slicks on my mountain bike were installed in 2007, they have seen the broiler that is a Toronto summer and now the worst Bruce county Winter in 5 decades,they have been in an unheated garage or shed since being installed, exceot for the 3 weeks the bike was on the work stand in the basement and no cracks on them.
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Old 03-22-11, 06:11 AM   #14
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I agree, i'm only 245 and I ride on 25's rather than 23's. everything I have read says it's all in your mind thinking that 23's are somehow faster at our weight.
In 35 years of cycling I've never ridden anything thinner than a 25, which has been my width of choice for almost all of that time. I'm not saying there isn't a place for 23s, but I've never felt the need for them myself.
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Old 03-22-11, 10:12 AM   #15
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In 35 years of cycling I've never ridden anything thinner than a 25, which has been my width of choice for almost all of that time. I'm not saying there isn't a place for 23s, but I've never felt the need for them myself.
I've ridden 23s, 24s, 25s, and 28s on my road bike. Speaking honestly: I'm not sure I could tell the difference between them unless I rode them back to back... and maybe not even then! With the way that manufacturers play fast-and-loose with sizing, there's not a whole lot of difference between these sizes for the most part.
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