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Witty McWitterson
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Discussion Starter · #1 ·
I'm thinking about buying one to run on my 29"er EBB bike. Ya think the EBB has enough 'give' to allow me to keep the same chain length by rotating front to rear on the 17/19 combo? I'm thinking fast course/hillly course gearing here since Wisconson goes from hilly to flat.

I hate changing freewheels AND changing the EBB position. I'm hoping this will allow me to only do one. Danke.
 

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try driving your car less
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~martini~ said:
I'm thinking about buying one to run on my 29"er EBB bike. Ya think the EBB has enough 'give' to allow me to keep the same chain length by rotating front to rear on the 17/19 combo? I'm thinking fast course/hillly course gearing here since Wisconson goes from hilly to flat.

I hate changing freewheels AND changing the EBB position. I'm hoping this will allow me to only do one. Danke.
not with the same front ring unless you are super lucky (all the way forward/all the way back). also depends on your EBB (how much throw). also, the chainline will be off on both.

get a rear wheel with a freehub and you will be fine. or get the dos eno and two front rings to make the same number of teeth.
 

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Witty McWitterson
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Discussion Starter · #3 ·
Chainring will be a 32T stainless jobbie from the good guys at Surly. And I am hoping for a front/back setting. I did just order one, so I'll report out soon enough. Guess I could go Dos ring as well...but I'll try one ring first.
 

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I've got two surly cogs(20t & 22t) squeezed onto the cassette style rear hub on my S.I.R.9, so I can swap gears easily without having to mess with changing cogs completely, depending on the days ride or race(but never during a race, that's cheatin!). The EBB gives enough adjustment to do this very easily. I put the two sloped sides of the wide base cogs facing each other, so the chain doesn't rub on the other cog. The front chainring lines up in the middle of the two cogs, so no real chainline issues. I haven't had any problems with this set-up, and it only takes a few seconds to change gearing. Also, I have a DOS on my cross single, set up with two rings in front(16/18 and 36/38). I have also used it on my old SS, with one ring and no issues. The two sets of teeth are close enough together that the chainline being off by a mm or two either way won't be a problem. Not sure if this is what you meant or not.
 

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not enough gear spread

I looked at the WI Dos set up, but in the end, it wasn't nearly enough gear spread for my use. So i went with a cassette up with 2 surly cogs and spacers and two chainrings. This is for a 26" commuter with horizontal dropouts and slicks. I have a few very steep hills and make the change once a day. Changing gears (42x16 and 36x22) in 20 sec or so. Much quicker than flip-flop. Seems like a cassette and cogs would work with EBB too?
 

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Misfit Psycles
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~martini~ said:
I'm thinking about buying one to run on my 29"er EBB bike. Ya think the EBB has enough 'give' to allow me to keep the same chain length by rotating front to rear on the 17/19 combo? I'm thinking fast course/hillly course gearing here since Wisconson goes from hilly to flat.

I hate changing freewheels AND changing the EBB position. I'm hoping this will allow me to only do one. Danke.
if you run the full DOS setup you will be fine. i really enjoy it and truth be told switching from one ratio to the next requires NO adjustment. just drop the wheel out - move chain - install wheel.

if you want to run the rear fw ONLY then you may not have enough adjustment - ideally and in theory, yes, but that requires the ebb to be at or very near the full 'back' position when on the 18 so that it can suck up the full link when going to 16.
 

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And the brake pads?

nogearshere said:
if you run the full DOS setup you will be fine. i really enjoy it and truth be told switching from one ratio to the next requires NO adjustment. just drop the wheel out - move chain - install wheel.
Does a DOS set up required you to adjust your rear brake pads when you are using track forks (ie. slotted dropouts)? Will the pads line up with the rim in exactly the same spot?
 

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Misfit Psycles
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Ginz said:
Does a DOS set up required you to adjust your rear brake pads when you are using track forks (ie. slotted dropouts)? Will the pads line up with the rim in exactly the same spot?
if you run the ring and the fw then YES - the pads will line up. the ratios used were picked to require the exact same # of links, leaving the axle in the same location...it's charming, really.
 

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Ok, last questioni

Could one achieve the same effect using the Dos freewheel and a typcial MTB triple crankset and Phil bottom bracket? I could mount two chainrings, one on the outter position and one in the middle adjust the chain line in the front to line the rings up with with the Dos freewheel (using the Phil BB rings).

In other words, is the spacing between the chainrings on the White Ind. Double Double crank similar to the spacing on a typcial MTB triple? That's the question....
 

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Witty McWitterson
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Discussion Starter · #10 ·
That's what I was looking for! Thanks skidmark. I should be getting it tomorrow. I'll report on it as soon as I can!
 

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Misfit Psycles
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Ginz said:
In other words, is the spacing between the chainrings on the White Ind. Double Double crank similar to the spacing on a typcial MTB triple? That's the question....
the spacing will be good. remember the key to the DOS is the fact that both ratios run the same # of links...so long as you run a matching set of rings (to the dos), you are golden!
 

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Chainline on the Dos Freewheel

Ok, so then the key piece of info is what chainline the Dos freewheel provides. I'm guessing each cog is a bit +/- of 47.5mm?

Anyone care to measure their DOS? :thumbsup:
 
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