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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 01-22-08, 12:51 PM   #1
sp00ki
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sugino RD + formula hubs + bb + c = perfect chainline?

When using sugino RD cranks and formula track hubs, what bottom bracket + cog = a 0 offset chainline?
Does anyone have experience with this combo and achieving a perfect line?
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Old 01-22-08, 12:58 PM   #2
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I have that setup with a stamped steel cog. I run a Sugino 103 bb. You need to run the chainring on the inside of the crank arms to get a perfect chainline.
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Old 01-22-08, 01:06 PM   #3
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wtf... there's no way around that?
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Old 01-22-08, 01:11 PM   #4
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Mine's on the outside, but I'd have to check if the chainline is perfect; I have no problems, but it's a 3/32 ring, 1/8 everything else.
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Old 01-22-08, 01:14 PM   #5
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I don't think so. I think the 103 is the narrowest english threaded bb. I made that mistake and rode about 10 miles with the chainring mounted to the outside of the crankarms, listening to the advice of a bike mechanic who told me that my chainline was "within tolerances." One weekend it hit me that running the CR on the inside would give perfect chainline.
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Old 01-22-08, 01:45 PM   #6
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That's frustrating.

Is there a way (spacer, et al) to get the cog to move 2mm or so (or more?) away from the center of the hub without introducing safety concerns?
Does that even make sense?
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Old 01-22-08, 01:46 PM   #7
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2mm isn't worth worrying about.
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Old 01-22-08, 01:50 PM   #8
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it seems to be doing quite a bit...
my gf's bike is off ~2 or 3mm (making the chain click noise when she rides). I haven't measured precisely, but using a ruler seems to indicate that a small bit of adjustment (sub 5mm, more like 2.5/3) would get everything lined up perfectly. there's no more room on the bb axle to play with, so i'm wondering if there's a different cog i can use (or spacers, etc) that might adjust the line closer to perfect.
i'm not worried about it, though it'd definitely be nice in the long run.
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Old 01-22-08, 03:38 PM   #9
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www.sheldonbrown.com/bbtaper.html

You may be able to get a 42 mm chainline if you get an ISO tapered bb rather than jis. If you can find a 106 mm ISO square taper cartidge symmetrical bb then that should work. I don't mind my chainline being off a few mm tho so I haven't tried.

Last edited by NeilMonday; 01-22-08 at 03:52 PM.
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Old 01-22-08, 04:05 PM   #10
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On my new build I have a 103bb with the RD cranks... running my messenger ring on the outside... My chainline (without a proper tool for measurement) is about 2-3mm off. People list the crank set as having a 45mm chainline with a 103mm bb. I have heard that this leads to negligible noise but until my chain comes in the mail... I have yet to test it out.

The problem I have is I don't have enough clearance on the chain stays to run the ring on the inside of the crank my chain ring would hit the stays... my Mark V wont allow it.
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Old 01-22-08, 04:36 PM   #11
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so frustrating. Sucks, as the cranks are powdercoated and will be a hassle to replace. There has to be a way around this-- why would sugino make a crankset it's impossible to get a straight line with?
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Old 01-22-08, 04:39 PM   #12
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I believe Paul hubs are all about the 44mm chainline, if that'll get you closer to your desired straightness.
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Old 01-22-08, 04:41 PM   #13
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Interesting. I'll look into that, thanks.
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Old 01-22-08, 04:53 PM   #14
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so frustrating. Sucks, as the cranks are powdercoated and will be a hassle to replace. There has to be a way around this-- why would sugino make a crankset it's impossible to get a straight line with?
i agree. just doesnt make sense.

I had rd's with a 103bb and formula hub and had no problems.
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Old 01-22-08, 05:01 PM   #15
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so frustrating. Sucks, as the cranks are powdercoated and will be a hassle to replace. There has to be a way around this-- why would sugino make a crankset it's impossible to get a straight line with?

did you powdercoat them with the ring on the spider? if so then that was stupid. If not, just put it on the inside and have a perfect chainline. I don't understand what the problem is. Get over aesthetics, and get silence your off kilter chainline.
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Old 01-22-08, 05:03 PM   #16
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did you powdercoat them with the ring on the spider? if so then that was stupid. If not, just put it on the inside and have a perfect chainline. I don't understand what the problem is. Get over aesthetics, and get silence your off kilter chainline.
As far as I can tell, aesthetics are the motivating factor around here.
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Old 01-22-08, 05:04 PM   #17
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did you powdercoat them with the ring on the spider? if so then that was stupid. If not, just put it on the inside and have a perfect chainline. I don't understand what the problem is. Get over aesthetics, and get silence your off kilter chainline.
no.
she took the time to powdercoat her crank arm for a reason.
there's nothing wrong with investing patience and resources to research and do things the right way.

(ps, powdercoating a crank + chainring is probably one of the dumbest assumptions you could've made about the situation)
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Old 01-22-08, 05:05 PM   #18
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so frustrating. Sucks, as the cranks are powdercoated and will be a hassle to replace. There has to be a way around this-- why would sugino make a crankset it's impossible to get a straight line with?
I believe RD stands for Road Double. If it was truly a crank made for single speed bikes it would have only one place for a chainring and that would almost certainly have a 42mm chainline. The difference between RDs and most other double road cranks is that they are marketed towards fixed gear/single speed riders and that is about it.
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Old 01-22-08, 05:07 PM   #19
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i wasn't aware.
maybe going with a completely different crankset is the way to go here...

*ed **** that. determined to get this working.

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Old 01-22-08, 05:50 PM   #20
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I believe RD stands for Road Double. If it was truly a crank made for single speed bikes it would have only one place for a chainring and that would almost certainly have a 42mm chainline. The difference between RDs and most other double road cranks is that they are marketed towards fixed gear/single speed riders and that is about it.
wait a second- are you sure about the road double thing? it doesn't have anything in place to allow for a second chainring, and is sold as a track/ss crankset.
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Old 01-22-08, 06:01 PM   #21
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the fact that you can put the chainring on the other side usually means it can be run as a double. i've run one on a 103 for a while and have had a silent drivetrain and no problems, i wouldn't worry about, you won't notice it. only problem is that the cliche velospace picture won't come out as nice.
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Old 01-22-08, 07:41 PM   #22
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I run the Sugino 103mm bottom bracket with the Messenger crankset (RD cranks and Messenger chainring). With the chainring mounted on the inside of the crank spider, I have a perfect chain line.

And really. It looks way cooler with the chainring on the inside. It's a win-win.
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Old 01-22-08, 07:44 PM   #23
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it's definitely a road double; mine came with both chainrings on it off of a specialized road bike.
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Old 01-23-08, 12:32 AM   #24
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[QUOTE=sp00ki;6030435]

there's nothing wrong with investing patience and resources to research and do things the right way.

[/QUOTE


then research the ****ing crank before purchasing it. also, trying it out on the bike before powdercoating it would've been a great idea.
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Old 01-23-08, 12:43 AM   #25
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isnt that the point?
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