Singlespeed & Fixed Gear - 44mm chainline...

It is said that the Sugino RD will give you a 44mm chainline.

If you wanted the same chainline on the 75's what would you have to do?

Why do the RD and 75's give you different chainlines?

The RD is a converted road double crank. The 75 is a true track crank.

Just get a 3mm longer bb spindle for the 75 and youll be close enough.

it kinda depends on you bb spindle length.

The easiest thing to do would be to not worry about it. 2mm off is not exactly tempting catastrophic failure.

Don't sweat it. I have had a Viner track for 5+ years without a straight chainline. I love 8 speed chains.

What does the chainline measurement actually refer to? (Excuse my ignorance.)

It's the distance from the center-line of the frame to the centerline of the cog or/(hopefully and) the crankset. http://www.businesscycles.com/graphics/chainline4.jpg

I personally rock PAUL comp hubs which have the 44mm chainline with 75 cranks. Because Paul hubs are just as nice as phils at less that half the price when on sale. You can definetely run a norrow "track" spindle on the 44mms and you won't have any problems. I just bought a shimano bb that's 109.5 I think to match my 44mm but you definetely don't have to. If you have the money, you might as well, otherwise no sweat.

I heard that phil hubs don't off a perfect 42mm chainline? Is this true... Because my phil hub lines up perfectly with my chain ring just as well as my formula hub did. This isn't a life or death thing, just out of curiosity.

Also, if you chainline is off my a millimeter or two, some chainrings can be flipped around.

paul could sell for more but for the fact that the idiots made their hubs and crank with a 44mm chainline. plus their crank uses a proprietary chainring with no real technical benefit. the only other stuff with 44mm chainline are mavic elipses, which aren't that great, and use proprietary lockrings. paul is ********, and will cease to be so when the re-tool for 42mm and make their crank width 130 or 144mm bcd.

BuddyMike is correct about the flipping your cog over to make a 44mm chainline hub line up a 42mm bb spindle, that helps a bit. Certain hub/cog/chain combinations it is possible. I know that flipping the cog with PAUL hubs, EAI cogs, and Izumi Super Toughness chain causes the chain to hit the spokes . I'm not sure if it is because of the recess on the EAI cog surface, or the extra wide chain.

I also agree with genericbikedude, whole reason I bought the PAUL hub was because it was under 100 bucks new on sale :). Don't look for PAUL to change their dimensions any time soon though, they aren't concerned with the actual track market, just the street fixed gear/singlespeed.

I meant flipping the chainring, not the cog.

paul could sell for more but for the fact that the idiots made their hubs and crank with a 44mm chainline. plus their crank uses a proprietary chainring with no real technical benefit. the only other stuff with 44mm chainline are mavic elipses, which aren't that great, and use proprietary lockrings. paul is ********, and will cease to be so when the re-tool for 42mm and make their crank width 130 or 144mm bcd.
I dunno if Paul is ******** per say, the reason they went with a 44mm chainline was to push the flanges out as far as possible. The further out the flanges are, the stronger the wheel. Considering that chainline adjustments are pretty easy by just getting a new spindle (if you're dropping $300 on a pair of hubs, a $30 spindle is chump change!), it doesn't seem like the worst thing in the world. And I KNOW that there are plenty of folks who think the paul cranks/chainrings are the best thing in the world.

The RD is a converted road double crank. The 75 is a true track crank.

Just get a 3mm longer bb spindle for the 75 and you'll be close enough.

Is it? I heard that about the XD.

Oh yeah. read this description: http://store.somafab.com/surdtrcr.html

Oh yeah. read this description: http://store.somafab.com/surdtrcr.html
That looks like a different model than the RD I have. That says RD8000 and looks way different.

Humm. Does yours not have tabs for an inner ring?

http://img.photobucket.com/albums/v629/mxlogik/sugino-rd.jpghttp://img.photobucket.com/albums/v629/mxlogik/rd8000.gif
On the left is the RD. On the right is the RD 8000. They look different, but both seem to be modified road cranks. The RD gives a 44mm chainline. I'm not sure about the 8000, I'm assuming its the same thing.

I dunno if Paul is ******** per say, the reason they went with a 44mm chainline was to push the flanges out as far as possible. The further out the flanges are, the stronger the wheel. Considering that chainline adjustments are pretty easy by just getting a new spindle (if you're dropping $300 on a pair of hubs, a $30 spindle is chump change!), it doesn't seem like the worst thing in the world. And I KNOW that there are plenty of folks who think the paul cranks/chainrings are the best thing in the world.

Yeah. Paul, when he initially designed his hubs was unaware that there was an existing chainline standard and pretty much pulled the 44mm figure out of his butt.



Dennis: I realized that your chainline is different too, how'd that come about?
Paul: The 44mm chainline is from pure ignorance. When I did the first ever mtb single speed hub I just pushed the freewheel out as far as I could so the wheel would be as strong as possible. This is how 52mm came to be considered the "normal" chainline for single speed mountain bikes.
So I did the same thing with the fixed hub and it turned out to be 44mm. After looking at other fixed gear hubs I concluded this would be close enough. Turns out that God, or some other higher being invented 42mm and we have been in hot water for this great sin ever since. This is one reason for us to do the crank. I could have just changed the hubs but I liked them the way they were, and I have a rebel streak anyway.

I believe my Bianchi Pista came with a SuginoXD crank.

This crank has two positions for chain rings, an inner and an outer.

I moved my chainring from the outer position to the inner position and the chain made much less noise.

So, what does the SuginoRD have, in terms of chain ring positions?

While we're at it, anyone know about the Sugino "RD2" crank? Is that different from the plain RD? Mine looks just like the RD, and has room for an inner ring, but with the recommended 103 BB the outer ring chainline is a 47!