Gears Feeling Lower After Tune Up
#51
Steel is real
as for the clinking sound, i'd take it back and ask for the derailleurs to be further tuned
maybe they didnt test ride the bike
maybe they didnt test ride the bike
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For air on the bike, I wouldn't rely solely on CO2. One CO2 cartridge may fail, or you may find you didn't patch the tube properly, didn't find and remove the sharp thing in the tire casing, didn't seat the tire bead properly meaning you need a second CO2 cartridge. So you carry two CO2 cartridges. Then you have a second flat . . .
CO2 was originally carried by certain racers, triathletes I think, who needed to be able to repair a flat as fast as possible. Most of us aren't racing against time when we have a flat.
It doesn't take much time to pump a tire with a frame pump, and I carry Silca frame pumps on two of my bikes, including the commuter. A mini pump takes longer, but still less than two minutes. Lezyne makes a mini pump that also accepts a CO2 cartridge, if you want to have cake AND cherry on top.
CO2 was originally carried by certain racers, triathletes I think, who needed to be able to repair a flat as fast as possible. Most of us aren't racing against time when we have a flat.
It doesn't take much time to pump a tire with a frame pump, and I carry Silca frame pumps on two of my bikes, including the commuter. A mini pump takes longer, but still less than two minutes. Lezyne makes a mini pump that also accepts a CO2 cartridge, if you want to have cake AND cherry on top.
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One strategy I have hear do but never seen is mtb racers who drill a second valve hole in the rim and race with two tubes installed. If they get a flat they just inflate the second tube with a CO2 inflator. Total flat repair time < 10 seconds. Two flats is a race ender, though.
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One strategy I have hear do but never seen is mtb racers who drill a second valve hole in the rim and race with two tubes installed. If they get a flat they just inflate the second tube with a CO2 inflator. Total flat repair time < 10 seconds. Two flats is a race ender, though.
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This is one of those ideas that may be better in theory than practice. The tubes have to be arranged so the "spare" is away from the tread side of the tire, and where it can't be "snake bit" Otherwise it's as likely to get punctured first an it is to be a good spare. Also, if the cause of the puncture is still there, the 2nd flat is close at hand.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
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This is one of those ideas that may be better in theory than practice. The tubes have to be arranged so the "spare" is away from the tread side of the tire, and where it can't be "snake bit" Otherwise it's as likely to get punctured first an it is to be a good spare. Also, if the cause of the puncture is still there, the 2nd flat is close at hand.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
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Originally Posted by Wilfred Laurier
One strategy I have hear do but never seen is mtb racers who drill a second valve hole in the rim and race with two tubes installed. If they get a flat they just inflate the second tube with a CO2 inflator. Total flat repair time < 10 seconds. Two flats is a race ender, though.
Originally Posted by dave42
I love the concept. May have to try it sometime. It seems like the extra tube might suffer some sort of abrasion if it were left in there long term. I guess it's not a long term sort of deal.
Originally Posted by FBinNY
This is one of those ideas that may be better in theory than practice. The tubes have to be arranged so the "spare" is away from the tread side of the tire, and where it can't be "snake bit" Otherwise it's as likely to get punctured first an it is to be a good spare. Also, if the cause of the puncture is still there, the 2nd flat is close at hand.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
Another version of the two tube approach is to install two tubes and pump them each equally, so if one is punctured the second replaces it at half pressure. If it's close to the end of the race this might be enough to let you finish.
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Not all time is equal. What if you flatted a few hundred yards or even a mile or two from the finish? Lost time only matters if you have enough time to make it up.
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I don't know, but FB made me think back to my last flat. One nail caused two holes in the tube and more or less cut it to ribbons in the process. The tire had two holes. I taped up the tire casing with electrical tape and changed the tube. Having 2 tubes in the tire would have been pointless. Increased rolling resistance(maybe), increased rotational weight(affecting acceleration). I don't really see a benefit. Possible bead seating issues. Etc etc etc.
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I don't know, but FB made me think back to my last flat. One nail caused two holes in the tube and more or less cut it to ribbons in the process. The tire had two holes. I taped up the tire casing with electrical tape and changed the tube. Having 2 tubes in the tire would have been pointless. Increased rolling resistance(maybe), increased rotational weight(affecting acceleration). I don't really see a benefit. Possible bead seating issues. Etc etc etc.
Again, I have never tried it or seen it in action, but logically it seems it might work - the biggest issue I can think of is getting the second tube to play nicely where it crosses the valve hole of the first tube.
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I would guess that such a scenario is rare in race situations. Depending on the locale of the race, thorns or goatheads might be a primary cause of flats, but racers would tend to have very carefully inflated tires that offer the optimum suspension on rough terrain, and thus might often be precariously close to pinch flatting. If the second tube was a smaller one - a 24 X 1.5 tube stretched over a 26" rim, for instance, it would safely sit in the hollow of the rim waiting for its chance to be a hero.
Again, I have never tried it or seen it in action, but logically it seems it might work - the biggest issue I can think of is getting the second tube to play nicely where it crosses the valve hole of the first tube.
Again, I have never tried it or seen it in action, but logically it seems it might work - the biggest issue I can think of is getting the second tube to play nicely where it crosses the valve hole of the first tube.
Perhaps the inner inner tube should have a prefab hole for valve stem of the outer inner tube.
Last edited by dave42; 02-17-15 at 10:41 AM.
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I would guess that such a scenario is rare in race situations. Depending on the locale of the race, thorns or goatheads might be a primary cause of flats, but racers would tend to have very carefully inflated tires that offer the optimum suspension on rough terrain, and thus might often be precariously close to pinch flatting. If the second tube was a smaller one - a 24 X 1.5 tube stretched over a 26" rim, for instance, it would safely sit in the hollow of the rim waiting for its chance to be a hero.
Again, I have never tried it or seen it in action, but logically it seems it might work - the biggest issue I can think of is getting the second tube to play nicely where it crosses the valve hole of the first tube.
Again, I have never tried it or seen it in action, but logically it seems it might work - the biggest issue I can think of is getting the second tube to play nicely where it crosses the valve hole of the first tube.
BTW OP - If you don't look at the wheel often (such as frequently airing it up), it might have even been touching the frame and dragging. Don't scoff, it's easy to miss. Regardless the mechanics eliminated some drag somewhere, and were I you I'd want to know for future reference so I'd ask them if they recalled what it was.
Last edited by wphamilton; 02-17-15 at 03:14 PM.