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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-07-06, 05:05 PM   #1
High Fist Shin
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Singlespeed - Fixed Gear Hub. Help Please.

I also posted this in the mechanics forum but perhaps you can help too...

I recently received a 1979 Falcon. The frame is Reynolds 531 and is in relatively good condition. It was originally a 10 speed with a Campy Velox group.
I want to rebuild it into a single speed/fixed gear with a flip flop hub but I don't seem to understand the part about hub sizing. I measured the rear drop outs and got 102 mm. Is this correct? That doesn't seem like an available size for fixed gear/single speed hubs.
Can anyone help shed some light on this for me? I just want to make sure I am measuring it correctly before I order any parts.
Pictures to follow...

Thanks,

Dante
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Old 03-07-06, 05:09 PM   #2
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are you measuring the distance between the dropouts? (from the left one to the right one).

they're prolly gonna be 126mm...
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Old 03-07-06, 05:17 PM   #3
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102? that's a really funny measurement. you should (i think, i haven't had to worry about this ever) be measuring from the center of each of the dropouts.
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Old 03-07-06, 05:20 PM   #4
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weren't all of the campy (and most other) 5 speeds 120mm spacing?
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Old 03-07-06, 05:27 PM   #5
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I think I may have found a clue. Do the chain stays look bent to you?



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Old 03-07-06, 05:29 PM   #6
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Here's a few more pics...







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Old 03-07-06, 05:33 PM   #7
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the dropout sure looks bent.

the spacing, as already mentioned, should be 120mm for a 5-speed
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Old 03-07-06, 05:37 PM   #8
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Any ideas on how to bend the stays back into position?

Dante
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Old 03-07-06, 05:41 PM   #9
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2x4 and string.

http://www.sheldonbrown.com/frame-spacing.html
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Old 03-07-06, 05:42 PM   #10
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heh, beat me to it. cold setting a la the man himself--sheldon.

invaluable site if you haven't used it before.
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Old 03-07-06, 05:56 PM   #11
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Gentlemen, I want to apologize. I checked it again and remeasured. This time I got 122 mm measuring the inside of the dropouts. I'm not sure what mistake I made before but thanks for the help.

New question. Can you recommend a wheel assy with a flip flop, free/fixed hub in the 120mm size?

Thanks.

Dante

P.S. Yes, Sheldon does have a great web site.
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Old 03-07-06, 06:09 PM   #12
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120mm is standard track spacing. so, basically anything will work.
IRO is the obvious answer

PS: get fix/fix. you can thread a freewheel on the fix side, and have a backup if you ever strip your lockring.
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Old 03-07-06, 07:26 PM   #13
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Would the bike having asymetrical stays prevent him from using a flip-flop?
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Old 03-08-06, 01:04 AM   #14
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nope. the stays can be whatever and as long as the chainline works on one side, it will work on the other side as well since the hub is symmetrical.

You can get a pretty decent basic wheelset for $130 with a fixed/free Formula hubset and Mavic CXP-22 rims. I got mine from Nashbar recently, but there is some other place selling them for about $130 (cheaper than NB's price for apparently the same wheels).

You'll be hard pressed to find a common modern track hub that isn't 120mm, so your stay spacing should work just fine. I wouldn't even worry about the extra 2mm, as the steel will *easily* flex that far just as you tighten the axle nuts by hand.
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Old 03-08-06, 01:08 AM   #15
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Quote:
Originally Posted by MacG
nope. the stays can be whatever and as long as the chainline works on one side, it will work on the other side as well since the hub is symmetrical.

You can get a pretty decent basic wheelset for $130 with a fixed/free Formula hubset and Mavic CXP-22 rims. I got mine from Nashbar recently, but there is some other place selling them for about $130 (cheaper than NB's price for apparently the same wheels).

You'll be hard pressed to find a common modern track hub that isn't 120mm, so your stay spacing should work just fine. I wouldn't even worry about the extra 2mm, as the steel will *easily* flex that far just as you tighten the axle nuts by hand.

actually, no.
if the stays are assymetrical (I'm assuming he's asking if the stays are offset to one side), then you have to respace the hub over the corresponding amount, and dish the wheel.
then the flop side won't line up.
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Old 03-08-06, 08:09 AM   #16
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I was assuming you would make chainline corrections with the cranks and BB. Respacing and dishing a symmetrical flip flop is pretty pointless.
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Old 03-08-06, 08:54 AM   #17
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Quote:
Originally Posted by baxtefer
if the stays are assymetrical (I'm assuming he's asking if the stays are offset to one side), then you have to respace the hub over the corresponding amount, and dish the wheel.
then the flop side won't line up.
Thats what I thought. From the first picture Dante posted, it looks like his stays aren't symetrical from the centerline of the frame, so a flipflop won't work. Unless the picture is taken at an odd angle or something.
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Old 03-08-06, 10:57 AM   #18
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Quote:
Originally Posted by MacG
I was assuming you would make chainline corrections with the cranks and BB. Respacing and dishing a symmetrical flip flop is pretty pointless.
ahh yes that too, but you can only do that if it's assymetrical in one direction.
In any case, it's a moot point. if the stays are out of alignment the bike will ride like shiat regardless of chainline.
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Old 03-08-06, 11:51 AM   #19
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Dante- Where in the great Keystone State are you located? Someone may be able to come up with a local bike shop that can help you out with the wheel (at least...).

Keep in mind that Tony of IRO fame is in Middleburg, so shipping may either be quick, or a local pick up. His rear wheel is $105...
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Old 03-14-06, 01:14 PM   #20
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Quote:
Originally Posted by DiegoFrogs
Dante- Where in the great Keystone State are you located? Someone may be able to come up with a local bike shop that can help you out with the wheel (at least...).

Keep in mind that Tony of IRO fame is in Middleburg, so shipping may either be quick, or a local pick up. His rear wheel is $105...
I live in Souderton, Pa. Nice little hilly town.

I will be getting wheels from Tony and IRO. Too many great reviews on IRO, and he is somewhat local. I also found a guy who does frame repairs. He can fix the frame, bead blast and powder coat for about $200.00. This sound pretty good to me. Now all I have to decide on is which color... Candy Orange maybe.
I'm going to drop off the frame next weekend for repairs and contact IRO the week after.

I'll keep everyone posted on the progress and provide pictures when I get the frame back.

Thanks everyone.

Dante
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Old 06-03-06, 08:06 AM   #21
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Any news yet? Naturally....I am curious.

Cheers,

Brian
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Old 06-03-06, 09:09 AM   #22
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I also found a guy who does frame repairs. He can fix the frame, bead blast and powder coat for about $200.00.
well I'm jealous.
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