My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
Worn cassette being paired with a new chain is probably the root cause and replacement is required. Of course, first make sure the RD is properly adjusted and the cassette is firmly locked down. --
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
On Dec 2, 5:57 pm, daveornee <daveornee.30z...@no-
mx.forums.cyclingforums.com said:
Frank Miles said:
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
Quoted message said:
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Quoted message said:
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Quoted message said:
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
a quagmire: new freewheel cassette, check the CR's teeth-see if the chain wraps around or lifts out of the u's tighten the friction shifters-hoops? clean and lube the cables/housings with Finish Line dry lube. try castrol marine grease on the botttom bracket guide if it's there. eliminate cable slack-grab the cable end with vise grips pull tight then tighten deray screw. buy a new rear deray at $15-it'll have a double not a single pivot.
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
Worn cassette being paired with a new chain is probably the root cause and replacement is required. Of course, first make sure the RD is properly adjusted and the cassette is firmly locked down. --
Are you thinking of chain skip? That's not what is happening here. FW (it's not a "cassette" of more current form) is tight.
My wife's bike is up-shifting under stress (going uphill). I'd like to
Quoted message said:
be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the
brand
Quoted message said:
or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame.
Pushing
Quoted message said:
on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
Well, daveornee, the idea of cable stickiness is a definite possibility. Will have to try that. Thanks! I should have known to check Sheldon's site. Sure hope he's doing well...
On Dec 2, 5:57 pm, daveornee <daveornee.30z...@no-
mx.forums.cyclingforums.com said:
Frank Miles said:
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
Quoted message said:
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Quoted message said:
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Quoted message said:
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
a quagmire: new freewheel cassette, check the CR's teeth-see if the chain wraps around or lifts out of the u's tighten the friction shifters-hoops?
The chain isn't skipping, as in when the teeth are deformed by wear. The problem is shifting from one sprocket to a smaller one. The wear on the FW teeth is actually minimal.
Quoted message said:
clean and lube the cables/housings with Finish Line dry lube. try castrol marine grease on the botttom bracket guide if it's there. eliminate cable slack-grab the cable end with vise grips pull tight then tighten deray screw. buy a new rear deray at $15-it'll have a double not a single pivot.
The _old_ derailleur was a Huret Duopar (titanium), and the gears have a wide range. I don't know of any cheap derailleur that will work as well as it does, despite its age. It's true that with enough wear that they don't work as well - I replaced one on my old touring bike - but I have to say the the Shimano LX (new) was minimally better than my old Duopar with many tens of thousands of miles on it. Her derailleur has quite a few miles on it but not nearly as many or as hard as the commuting miles on mine. Still, I'll check it's action and whether its sticky.
The BB cable guide is a definite possibility - will have to try that one.
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
Worn cassette being paired with a new chain is probably the root cause and replacement is required. Of course, first make sure the RD is properly adjusted and the cassette is firmly locked down.
I'll go with a loose cassette lockring. Check this.
My wife's bike is up-shifting under stress (going uphill). I'd like to be able to fix this. We've checked the shifters - old Campy braze-on down-tube shifters - as far as she can tell, they're not moving. Swapping parts with the shifters from another bike hasn't improved things.
One thing has changed - we replaced the old SunTour Ultra-6 freewheel with a newer (but used) one; and the chain was replaced with a new one from a local bike shop. Unfortunately neither of us remember the brand or width of the chain. My dim recollection is that it was probably a 7-speed chain, though the LBS guy told her it would work on her bike.
Her bike is not terribly flexy - it's a small Columbus SL frame. Pushing on the bottom bracket from either side seems normal; no obvious frame damage. She's fairly lightweight and not a heavy masher. I've tried duplicating the problem, but wasn't able to - though I can't duplicate the problem entirely as the bike is 'way to small for me.
Any ideas what might be responsible? It's really annoying when this happens! TIA for any ideas...
The problem falls at the time of temperature drop? clue. total sticktion inside cable/housing plus deray is opposed by the friction at the friction shifters. So if screwing down the shifters cures the problem then cleaning, lubing cables/housing with a lighter lube or replacing with dry teflon for the winter then lubing with wax teflon for the summer ...
