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Chaning freewheel from 6sp to 7sp- Chain?

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Chaning freewheel from 6sp to 7sp- Chain?

Old 07-07-06, 12:38 AM
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seaneee
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Chaning freewheel from 6sp to 7sp- Chain?

Hello. I'm converting my Bridgestone 400 27" wheelset to 700c and in the process I am going with a new nashbar 7sp freewheel. Other than the derailleur adjustments, what are the other implications? Will my exisiting chain work (length etc). I've heard that when you swap your freewheel you should also change the chain. Any advice would be great.
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Old 07-07-06, 04:33 AM
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Originally Posted by seaneee
Will my exisiting chain work (length etc). I've heard that when you swap your freewheel you should also change the chain. Any advice would be great.
This is sound advice when replacing a freewheel. I'd get a SCRAM PC58 and follow the instructions on the Park Tool website to size it corectly.
Also, when you go from 27" to 700c make sure your brakes will reach the rim of the smaller 700c wheel.
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Old 07-07-06, 04:44 AM
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If your chain is worn out, you should get a new chain. But unless it's an old 6-speed chain, it's the same width as a 7-speed chain.

If you respace the wheel (by adding a spacer to the drive-side axle, since a 7-speed freewheel is slightly wider than a 6-speed freewheel) it may be worth re-dishing the wheel too, so that the rim is centered between the two nuts.
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Old 07-07-06, 06:53 AM
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Dont respace the wheel, the dropout width/locknut spacing is the same whatever freewheel you use.
The 7 speed should be a straight swap for the 6, no redishing required. Check that you have enough clearance for the chain to run between the small cog and the seatstay.
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Old 07-07-06, 07:21 AM
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Originally Posted by MichaelW
Check that you have enough clearance for the chain to run between the small cog and the seatstay.
I think this is what Tim was warning against and why the OP may have to add a thin spacer on the drive side of the axle. The change may not be enough to warrant redishing.

To the OP:

Are you buying a "freewheel" wheel or a "cassette" (i,e. freehub) wheel? I really recommend getting a casette freehub if you can. 7-speed cassettes are still readilly available a but 7-speed freewheels are difficult to find and very limited in available gearing range.

As noted, be sure your brakes will adjust enough to align with the smaller 700c rim. You need to be able to lower the brake blocks 4 mm to match the 700c rim.

A Bridgestone 400? That was my first "good" bike back in 1985 and I have very fond memories of it.
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Old 07-07-06, 09:24 AM
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It's definitly a freewheel. I found a set of matrix 700c wheels that are going to replace the 27s. As for brake clearance, yep, I reaches when maxed out (first thing I checked).

As for the chain, I had the LBS tell me that it had a year or two left in it. Would it be smart to just go ahead and replace it since I am doing the freewheel and wheelset? Also the SCRAM PC58 is listed as 8 speed, are you talking about resize this to work with 7sp?
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Old 07-07-06, 02:48 PM
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Originally Posted by seaneee
As for the chain, I had the LBS tell me that it had a year or two left in it. Would it be smart to just go ahead and replace it since I am doing the freewheel and wheelset? Also the SCRAM PC58 is listed as 8 speed, are you talking about resize this to work with 7sp?
Yes it would, as you are putting in a new freewheel.
I've used the PC58 on two 6-to-7 speed conversions. I think I had to remove two or three links for proper chain length.
As to axle spacing, my Miyata 512 came with a Preformance/Mavic wheelset spaced 126mm and all I had to do was unscrew the old freewheel and screw in the new one. My Miyata Triplecross was spaced 130mm, and I had to do the whole drill (re-space axle, add spacers, re-dish wheel).
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