Bicycle Mechanics - Overhauling the rear derailleur,gear sprocket and shifters
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I have a pretty cheap mtb with a 6 speed freewheel sprocket and the rear derailleur is i need of replacing.
I have decided to upgrade to a 7 speed arangement. Im new to this sort of thing so i was wondering if you could tell me if this arangement of components will work together.
- SHIMANO TOURNEY RD - TX31 Rear Derailleur
- Shimano Acera ST-EF29 E Z Fire Mountain Bike STi Gear Levers
- Shimano 7 sp megarange freewheel block(asumming my wheel can take 7 gears)
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7-speed is (probably) wider than the 6-speed so you may have an issue fitting it into the frame. Otherwise probably okay.
07-13-09, 08:43 PM
DMF is right - frame clearance issues are the main problems with the upgrade you're considering. It might be as easy as spreading the rear triangle 5mm and inserting a spacer. Or you could get one of the narrow 7-speed freewheels and narrow chain and it will squeak by. Trial and error with your particular frame and parts choices.
I have an old Raleigh road frame that had a 5-speed freewheel. Tried replacing it with another, newer 5-speed freewheel, and the outer edge dragged on the derailler attachment nut! The newer freewheel was about an eigth of an inch wider at just the right (wrong!) place, and it would rub. Deciding against spreading the frame - got a vintage Maillard 5-speed freewheel and rebuilt it. Works like honey now!
Similar here. I crammed a 7-speed (being somewhat cheaper than 6-speed replacement) into a Ross steel frame and it clears everything, but the Tourney(?) shifter won't get all 7 cogs.
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