|Re-spacing a C-Record rear hub
Aug 5, 2002 1:50 PM
|I have a C-Record 7 speed hub that has been spaced to 130 mm and I need to take down to 126 mm. I would assume that the spacers should come off the left side to maintain a constant distance from the right frame to the littlest cog. There is a chance, though, that it has been spaced out on both sides so that a previous owner would not have to re-dish the wheel. Does anyone have a 126 handy that they can measure? This one is 28.5 mm from C to A (see picture) and 38 mm from C to B. I would like to get it correct (and re-dished) because it is now a built wheel that I sold and will be shipping cross-country. (LEFT & RIGHT refer to as on the bike, not in the picture.)
|Here's the deal||Kerry|
Aug 5, 2002 4:30 PM
|The spacing of a Campy hub takes place by changing the shiny aluminum spacer on the drive side, which is also known as the right side (when seated on the bike). You can play around with this by inserting extra washers on either side. Pulling out the dust cover on the left side will tell you if this has been done, though it doesn't look like it from the picture. If there was an extra washer on the left side, then the left lock nut would stick out farther from the end of the dust cap. If you remove 4mm of spacer (changing spacer really), you run the risk of the axle ends extending past the dropouts. If this happens, the QR will not hold the hub in the frame. Usually, when you change spacing by this much, you need to swap the axle as well. You can determine whether you need an axle swap by looking at how much the axle ends are recessed into the dropouts. If they are recessed less than 2 mm (on both sides = 4 mm combined), you need a new axle.|
|re: Re-spacing a C-Record rear hub
Aug 5, 2002 6:59 PM
|Are you sure it is a seven? What brand of freewheel is on the hub? If it is a Sachs, good. If not, when you replace it with a Sachs in the future, you may have clearance problems in a 126 frame. Sachs makes its bigg cog further fom the center of the hub than other brands. This pushes the small cog way close to the dropout face. Frequently on older bikes the chain will go onto the small cog and then bind on the seatstay on the way off. These are things I have seen, that you should be aware of. Your results may vary.|
|Confused. Guess I need a primer
Aug 6, 2002 12:39 PM
|First, I have never owned a freewheel. I went straight from my single speed coaster brake (~1963) to indexed Shimano/Campy 9 and 10 speed cassettes (2000). I did not even own a bike in between. I have a lot of catching up to both in knowledge and different types of riding. I'm trying to do it all at once.
One of my current projects is wheel building. I've built a couple dozen and, though very slow, am building a good, tight, even-tensioned wheel. This wheelset uses a pair of old Campy hubs and some new Omega 20 Strada XL rims.
The hubs are in great shape and took a beautiful polish. I bought them as Nuovo Record, but have been told that they are C-Record. The guy I'm selling them to is restoring an old French 10 speed (2 front, 5 rear) bike with 95 mm rear frame spacing. The 5 cog freewheel is an Atom. He would like to change out some/most/all of the components to old Campy. He has a Nuovo Record rear derailleur and these wheels so far.
OK for background. I have assumed that, given the correct threads, axle length, etc., the width from the drive side of the hub body to the drive side lock nut face would determined what size freewheel will fit. If this length is correct, the face-to-face length is the same as the frame, the axle is the right length, and the wheel is dished to the center, then it will work. The over-all spacing (ie. 130 mm to 126 mm) would be adjusted on the non-drive side of the hub unless you wanted to use a different size freewheel.
Right Wrong? HELP!
|The can of worms is open!||Kerry|
Aug 6, 2002 5:12 PM
|First, there is no such thing as a 95mm spaced rear end with a 5 speed FW. That would be 2 cm narrower than for a 6 speed! 5 speed was 124 mm, IIRC. Second, you run the risk that this guy has a FRENCH threaded hub for his Atom FW, so he might not be able to use that unit (nor would he likely want to - the Atom was, in today's terms, crap). Finally, putting C-Record on an old French 10 speed seems like pearls before swine, and it sure isn't a restoration!|
|The can of worms is open!||curlybike|
Aug 6, 2002 6:32 PM
|There was a Gitane Model above the TDF that was full Campy NR. Saw it in the literature and worked on it. Otherwise they were loaded up with Simplex and equal junk. Thought I would fill in a little missing info. I have an old French bike, Gitane TdF, nice ride, pain to get parts. Only thing original is crank and BB|
|NOT 95 REAR - 126 rear, 95 front...||TFerguson|
Aug 7, 2002 2:55 AM
|That's why I'm trying to get it to 126.
I read and re-read that post a dozen times and still got it wrong!!!!