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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 08-20-11, 06:50 PM   #1
merlin55
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GP4000s treadwear dots are gone, how many more miles???

700x23, and I'm 170 pounds, and 105 psi in the tires...I'm guessing 2500 miles so far on the back tire, no cuts, a few flats...just wondering when the cord willl starting showing....these tires are really great
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Old 08-20-11, 09:30 PM   #2
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As long as you're wondering keep riding the tires, but don't go out on any multi-day trips. Not counting punctures or cuts, there's at least 100 miles left when the under-tread begins to show through, so you don't have to worry about getting stranded.

At this point I'd buy the replacements to have them handy so there's no lost time when the tire finally gives up the ghost.

BTW- I live in the metro NY area, and have no need for tread wear dimples. The local roads take care of that for me. All my tires have plenty of nicks and small cuts that aren't deep enough to cause a flat, but allow me to know how much rubber is left.
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Old 08-20-11, 10:36 PM   #3
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put 3500 on my rear tire before the indicators were worn out. thought about taking them further but it appeared to have small microcracks starting to develop around the tire in the area that had been worn flat. guess the roads i ride here are a little more forgiving here because i tip the scale around 255 lbs.
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Old 08-20-11, 10:40 PM   #4
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I'm sure if you call the tire manufacturer they will recommend you replace your front and rear tires immediately.
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Old 08-20-11, 10:55 PM   #5
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put 3500 on my rear tire before the indicators were worn out. thought about taking them further but it appeared to have small microcracks starting to develop around the tire in the area that had been worn flat. guess the roads i ride here are a little more forgiving here because i tip the scale around 255 lbs.
The micro cracks aren't a reason to quit on these tires if they're otherwise OK (wear doesn't count). As it ages from exposure to UV and water, the tread rubber hardens a bit, and begins to form these small cracks because of the constant flexing.

The flip side is that this aged rubber is often much tougher than when it was new, which may be why tires that reach a certain age tend to keep going forever.

Barring structural problems that cause lumps or wiggles you can ride these diehards until the cords show through.
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Old 08-21-11, 03:16 AM   #6
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At this point I'd buy the replacements to have them handy so there's no lost time when the tire finally gives up the ghost.
+1 great idea
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Old 08-21-11, 03:54 AM   #7
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At this point I'd buy the replacements to have them handy so there's no lost time when the tire finally gives up the ghost.
+1
Each of my bikes has a new tire hanging on the wall for the point in time when it a needs a tire replacement. When I use the new tire, I immediately order another.
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Old 08-21-11, 04:09 AM   #8
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When you can see the cords through the lack of rubber, it's time to replace.
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Old 08-21-11, 08:51 AM   #9
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+1 great idea
No offense intended, but it's kind of scary when someone considers buying a replacement tire in advance as a "great idea". Do you wait until you find the canister empty some morning before buying more coffee?

I don't advocate buying all kinds of spares in advance, but as you see that you're getting near to needing brake shoes, tires, cables, etc. buy the replacements and have them available when the time comes. Notice I didn't list tubes, the spare should already be with your bike.
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Old 08-21-11, 07:39 PM   #10
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I have a pair of keen sneakers that I really like, they're about a year old. I was looking on zappos for something else and I saw the exact model on sale for $30 off, so I have a brand new pair of shoes just waiting for the old ones to die.
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