Bicycle Mechanics - Will 7 speed cassette hub replace 6 speed freewheel?

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vulpes
05-22-07, 09:48 AM
An acquaintance gave me a set of wheels he didn't need. They are 26" off a mountain bike. The rear wheel has a splined cassette hub. The wheel I want to replace with it is an older screw-on 6 speed freewheel. The axle on the cassette hub looks about 1/2 or so longer than the one on the freewheel (It has a quick release). Is there any way to get this upgrade to work? The frame is an old Puch Mistral lugged steel roadie frame.

Thanks in advance for your input on this.

well biked
05-22-07, 10:14 AM
The rear dropout spacing on the six speed road bike is probably 126mm. The seven speed mountain bike wheel probably has the axle spaced for either 130mm or 135mm dropout spacing, depending on how old it is. This can be dealt with by either flexing the dropouts apart by hand a few millimeters (if there's only 4mm difference between axle spacing and dropout spacing) or cold setting the frame. But what about the size of the rims? Is the Puch frame meant for larger diameter rims, either 27" or 700c? If so, the brakes won't come close to reaching the 26" rims-
vulpes
05-22-07, 10:20 AM
The rear dropout spacing on the six speed road bike is probably 126mm. The seven speed mountain bike wheel probably has the axle spaced for either 130mm or 135mm dropout spacing. This can be dealt with by either flexing the dropouts apart by hand a few millimeters (if there's only 4mm difference between axle spacing and dropout spacing) or cold setting the frame. But what about the size of the rims? Is the Puch frame meant for larger diameter rims, either 27" or 700c? If so, the brakes won't come close to reaching the 26" rims-

The Puch frame already has 26" wheels on it with cantilever brakes that seem to work fine.

What do think of the idea of spreading the dropouts using some sort of turnbuckle arrangement rather than levering the chain stays apart with a 2x4?

well biked
05-22-07, 10:27 AM
The Puch frame already has 26" wheels on it with cantilever brakes that seem to work fine.

What do think of the idea of spreading the dropouts using some sort of turnbuckle arrangement rather than levering the chain stays apart with a 2x4?


See explanation in the "126mm frame vs. 130mm wheels" thread, post #9-:)
vulpes
05-22-07, 10:33 AM
Got an answer to the alternate preading method on the 126mm frame vs 130mm wheels (http://www.bikeforums.net/showthread.php?t=300723) thread.