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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 12-08-09, 06:42 AM   #1
Scrodzilla
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Sugino RD users?

I picked up a barely used set of Sugino RDs last night on the cheap for a project I'm helping a co-worker with (he's reimbursing me but I'm building his bike) and I know there are some wonky chainline issues surrounding this crankset but I'd like to hear from someone who is using them...is it really that bad?



I've read some stuff on the interwebs that a 103mm BB will give a 45mm chainline with the ring on the inside, while other stuff I've read says it's 45 with the ring on the outside. I've also noticed that in just about every pic I see on VeloSpace and whatnot of bikes with RDs, the ring is properly placed on the outside (where I'd ultimately like it to end up). In fact, I haven't found one pic of a bike running the ring on the inside. What's the deal with these?
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Old 12-08-09, 07:50 AM   #2
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I run it with the "matching" Sugino 103 BB--- and it is fine. I care less about the theoretical issues of chainline "as measured" and more about real-world effects. I run a 8-speed SRAM road chain, and my drive train is absolutely silent--- running on the outside of the spider.

Realistically, I believe running with a 3/32" drive train, the world is quite forgiving. If you really want, I can measure the chainline.

I suggest just building it up, and using the inside of the spider as a fallback strategy.
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Old 12-08-09, 08:03 AM   #3
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Right on. We're not too concerned with chainline being precisely straight but don't want it to completely suck either! The chainring it came with is 1/8" so I'll have to try that first.
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Old 12-08-09, 08:13 AM   #4
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I've run those cranks on my Pake with a 103mm bottom bracket, and the 103mm bottom bracket does give you a 42mm chainline with the chainring on the outside.
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Old 12-08-09, 12:59 PM   #5
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How is that possible? Seriously.

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Originally Posted by Coomer View Post
I've run those cranks on my Pake with a 103mm bottom bracket, and the 103mm bottom bracket does give you a 42mm chainline with the chainring on the outside.
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Old 12-08-09, 02:05 PM   #6
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I don't think it's possible either. Everything I've read...even according to Sugino's site...states a 45mm chainline.
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Old 12-08-09, 02:06 PM   #7
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I run mine with a Sugino 103 BB and the CR on the outside, and get a visually perfect chainline and very silent running.
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Old 12-08-09, 03:31 PM   #8
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I've never had a problem with the chainline, but I've never measured it either. Sugino's website says 45mm chainline with a 103bb: http://www.suginoltd.co.jp/japan/sin...list_japan.htm
If you use a 107bb and put the chainring on the inside, that will give you a 42mm chainline. But according to Sheldon, your hub/cog chainline stands a good chance of being closer to 43mm or greater anyways: http://www.sheldonbrown.com/chainline.html, and a difference of 1-2 mm isn't really going to be noticeable.
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Old 12-08-09, 03:37 PM   #9
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I don't think it's possible either. Everything I've read...even according to Sugino's site...states a 45mm chainline.
It is 45 on mine. I was disappointed, as I fell for the marketing fluff of some website where I bought it---- something like "for the perfect chainline, try our matching Sugino 103 BB" or something to that effect. But functionally, all is well.
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Old 12-08-09, 04:42 PM   #10
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I run it on my Pake with the 103mm bb and the ring on the outside. I run a Sram 9sp chain on a Dura-Ace cog. The drivetrain is not completely silent but there are no issues. I dont mind a little noise.
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Old 12-08-09, 04:43 PM   #11
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Thanks for the info/feedback guys. I know it won't be a big deal to be off by a few mm. Once my buddy's wheelset arrives on Thursday, I'll give it a go with a 103mm BB. I've got a 1/8" chainring & chain on hand - would it help in this instance to use a 3/32" cog or should it not matter?

edit: Deshi - I checked out your Pake on VeloSpace. Your chainline looks damn good.
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Old 12-08-09, 05:52 PM   #12
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They are fine with the 45mm chainline. Depending on the hub and cog combo, you will have a chainline ranging from 41-43mm.
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Old 12-08-09, 07:56 PM   #13
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I'm pretty sure it was a 42mm chainline with the 103mm BB and chainring on the outside. My girlfriend's bike has RD2 cranks on it with a 103mm Sugino BB and the chainring on the outside. I'll measure the chainline and take photos tonight.
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Old 12-08-09, 08:10 PM   #14
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Right on, man. Thanks!

My friend at work has been into bikes for a long time (BMX) but this is his first fixed gear and I don't want to end up building something he'll have trouble with.
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Old 12-08-09, 10:44 PM   #15
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I've got a stock Salsa Casseroll that has a Sugino RD2 on a 103 BB. The stock hub is a 130 Surly new hub with a chainline of 47.5. That hub is not a re-spaced track hub and the 47.5 chainline was verified by Surly and is about what I eyeball it.

The chainring is mounted to the outside, and appears to be close to 46/47. Looks pretty lined up to me, is quiet, and has given me no problems over the 1200+ miles I've had it. But I'm no expert.
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Old 12-08-09, 11:36 PM   #16
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Quote:
Originally Posted by filtersweep View Post
How is that possible? Seriously.
The chainline on his Paul's hub is NOT 42mm, it is in fact 44mm. http://www.paulcomp.com/highflangerear.html

That is why it's straight, or damn near straight.

Last edited by Wil; 12-08-09 at 11:38 PM. Reason: Clarity
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Old 12-09-09, 01:56 AM   #17
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The chainline on his Paul's hub is NOT 42mm, it is in fact 44mm. http://www.paulcomp.com/highflangerear.html

That is why it's straight, or damn near straight.
Damn, you're absolutely right. I knew it was a perfect chainline, but forgot about the weird spacing on the Paul hub. Sorry for posting misinformation.
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Old 12-09-09, 02:11 AM   #18
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I run it on my Pake with the 103mm bb and the ring on the outside. I run a Sram 9sp chain on a Dura-Ace cog. The drivetrain is not completely silent but there are no issues. I dont mind a little noise.
As for Deshi, I don't exactly know why, but in my experience, 9-speed chains just don't seem to work as well as 8-(7-6)s.
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Old 12-09-09, 10:06 AM   #19
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I'm running the RD2s with the chainring on the outside, a matching sugino 103BB, 1/8" SRAM PC-1, and Novatec sealed high flange hubs. Chainline comes in exactly at 45mm. Chain is dead silent unless I am resisting.
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Old 12-09-09, 12:11 PM   #20
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road double cranks are the best quality for your dollar.
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Old 12-09-09, 12:37 PM   #21
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They were 35 bucks.
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Old 12-09-09, 01:03 PM   #22
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They were 35 bucks.
thank you for illustrating my point.
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Old 12-09-09, 01:14 PM   #23
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Hahaha!
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Old 12-09-09, 01:24 PM   #24
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I've got a stock Salsa Casseroll that has a Sugino RD2 on a 103 BB. The stock hub is a 130 Surly new hub with a chainline of 47.5. That hub is not a re-spaced track hub and the 47.5 chainline was verified by Surly and is about what I eyeball it.

The chainring is mounted to the outside, and appears to be close to 46/47. Looks pretty lined up to me, is quiet, and has given me no problems over the 1200+ miles I've had it. But I'm no expert.
+1

I have the same bicycle except mine is not stock. I have a Sugino 103 BB and the Sugino RD2 cranks. I have a chainline of 45 on the outside. Maybe 46. I wear glasses, so my eyesight is not the best.
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Old 12-09-09, 08:20 PM   #25
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+1

I have the same bicycle except mine is not stock. I have a Sugino 103 BB and the Sugino RD2 cranks. I have a chainline of 45 on the outside. Maybe 46. I wear glasses, so my eyesight is not the best.
Took another look at my Casseroll and it sure looks to be a little over 46mm. However, there is a bracket (for a chain guard) that is between the bottom bracket shell and the bottom bracket. I just left it there until I do a major overhaul.

The bracket is a little over 1mm thick. So if the chainline is normally 45mm, I think this "spacer" explains why mine is a little over 46mm.
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