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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 01-29-06, 06:56 PM   #1
spalato
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bike mechanics that will make you laugh and cry...but a serious question!

Please dont ask why I did this to my bike, its currenty the bike I use for couriering and my rear wheel was stolen, so I needed a quick fix and a wheel with a 5 speed freewheel on it was the only option...my previous wheel had a 7 speed casette on it...
Anyways, I use downtube shifters and I had to switch the rear (right) one to tension because if I used index I obviously would not be able to shift with my 105 rear derailer...
My 'serious' question is: Will this combination keep me alive, I already test rode it for an easy 5 miles home and shifted around, sometimes the chain got 'caught' or 'stuck' or whichever way you want to imagine it between two gears and my crank would slightly spin out, until the chain fell into place...I got over this problem after a bit...
The real thing I would like to know is if it is dangerous to use a 7 speed chain and a shimano 105 derailer that is meant for seven speed (maybe 8 as well, im not sure) on a 5 speed freewheel?

I REALLY NEED ANSWERS BECAUSE I GOTTA WORK TOMMOROW AND IM SCARED!!!!



THANK YOU sooooo much for any advice and I hope you had a good laugh reading this
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Old 01-29-06, 07:19 PM   #2
TallRider
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Running your down-tube shifter in friction on a 5-speed freewheel should be no problem at all, in principle.

Your "getting stuck between two gears" may just indicate your lack of experience with friction shifting. It's possible that your freewheel's teeth are worn, causing chain skip, but if that were the case you'd also have problems when you weren't trying to shift.

Be strong and courageous, little one
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Old 01-29-06, 07:28 PM   #3
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It should work. the difference between the really old chains and the old chains is only .2mm. i believe timcupery has a point with technique being the answer.
If it makes you real nervous, pick a gear that you can use all the time and leave it in that one, a faux singlespeed.
This axle is spaced like your stolen one. right? If it is you can pick up a cheap 7 speed freewheel that will go right on(barring a very few exceptions)
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Old 01-29-06, 08:03 PM   #4
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Just set the limit screws on the RD so that you don't drop the chain off the outside and inside and you'll be fine. Learning to shift with friction requires some finesse. Basically you overshift the chain so it falls fully into the next cog, then return the lever a tiny amount to center the chain over that cog.
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Old 01-29-06, 08:36 PM   #5
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Quote:
Originally Posted by DannoXYZ
Just set the limit screws on the RD so that you don't drop the chain off the outside and inside and you'll be fine. Learning to shift with friction requires some finesse. Basically you overshift the chain so it falls fully into the next cog, then return the lever a tiny amount to center the chain over that cog.
thank you very much, that was what i was hoping to do in the end anyway...

thanks to the both of you for your advice
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Old 01-29-06, 09:19 PM   #6
TallRider
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Oh, and do clean your chain and sprockets. They look really ugly with thick, dirty grease. Will take you five minutes (including washing hands afterwards) if you have a rag and some ProLink (or some other chainlube that also cuts old grease).
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Old 01-29-06, 09:29 PM   #7
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I've used that same derailleur with friction shifting on 5,6,7 and 8 speed freewheels and cassettes. Sounds like your chain and the 5speed freewheel aren't meshing well.
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Old 01-30-06, 06:18 PM   #8
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before you oil that chain and the freewheel, you may want to hit it with some wd-40 and a medium firm wire brush, also get the wheels and the derailleur, sometimes pulling any dirt off with your fingers. those derailleur wheels should be very clean (besides some good oil)
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