Bicycle Mechanics - Tiagra 9sp. with 7sp. freewheel ???

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brandenjs
12-28-07, 06:09 AM
I received a Tiagra 9sp. RD for next to nothing, will it work on a 7 speed Shimano HG freewheel with Shimano 7sp. SIS shifters. I would think that as long as the limit screws are adjusted correctly it would work with the range I need. I'm sure there are plenty of you guys out there who built a budget project and tried all kinds of combinations as the parts became available.

Retro Grouch
12-28-07, 06:25 AM
Depends. If your largest cog is around 27 or 28 teeth it'll work fine. If your largest cog is 32 or 34 teeth the derailleur pulley will rub.
brandenjs
12-28-07, 11:58 AM
Yeah I've got a 28 on there now. I was considering getting one of the megarange freewheels but thats quite a jump to the big cog. I'll give it a try. Thanks..

brandenjs
01-24-08, 03:03 PM
Just a follow up on this thread....I put the RD on and a new freewheel along with a new chain and it works beautiful. A little fine tuning and off I went...
Sheldon Brown
01-24-08, 06:56 PM
I received a Tiagra 9sp. RD for next to nothing, will it work on a 7 speed Shimano HG freewheel with Shimano 7sp. SIS shifters. I would think that as long as the limit screws are adjusted correctly it would work with the range I need...Keeeeerect!

Rear derailers don't care how many speeds, that's just marketing.

Sheldon " http://sheldonbrown.com/speeds " Brown