Fixed cogs hooked to disc mounts?

[bennyprofane]

This may be colossally stupid idea but. . .
I've got a SS disc wheel set that I'd love to use as a flip-flop. . .

Seems that I remember someone hooking up a cog using the brake mounts on a disc hub, but I can't seem to find any cogs of this sort. . .

Other than (perhaps) chainline issues, does anyone have any experience/advice in this department?

Cheers,
Ben

Edit:
So I found a "How To" article, but I don't have access to a drill press. Anyone know of a pre-fab version?
http://www.63xc.com/jasom/milldisc.htm

[markie]

Yep. Works for me on my 29 Redline. Chainline is perfect off of the bat. I got a Boone cog.

The only downside is the smallest cog that will work is around 16T.

[cMc]

I want to try that in a bad way, but not quite bad enough to shell out for a Boone cog. If anyone finds a cheap one, let me know!

[markie]

Well if you do not like it you can out your boone cog for 80% of what you gave for it in this forum......

Or you can drill tour own cog....

[WunSpeedWunder]

Yeah,That was me,just not sure which tag i was using-search wunspeedwunder or onespeedwonder back in Jan/Feb 07 and you should see pics.I used a cog from Funn designed for their screw on hub-i had to grind their flange off,I think this may have softened the steel just enough to be able to drill 3 holes for disc flange mounting,didn't ride it that far tho' , don't really have the balls for fixxing!!:D

[Family Guy]

I've heard of folks having some luck with Shimano DX BMX cogs. Under $10 retail. The steel used is pretty hard, so expect to go through a few bits. I'd recommend a drill press and lots of cutting fluid.

[myron]

I tried this once, I think you would be better of buying a Boone. I used a dimension Shimano style $3 cog. Even with new Ti drill bits and a drill press it wouldn't even touch it.

I had to heat the cog till it was red hot,wrap it in foil, then throw it into a toaster oven preheated to 200f. After doing that is was soft enough to drill, but needed to be re- hardened. Red hot again, then packed in oily sand, THEN red hot again, THEN cool it down with compressed air.

All this to save $40. Never again.

[bdee]

These guys make some nice bolt on cogs and hubs as well:

http://www.levelcomponents.com/dev.html

[davkatreb]

These guys make some nice bolt on cogs and hubs as well:

http://www.levelcomponents.com/dev.html
Holy $$$$$$hit! And you thought a Boone cog on a hub you already paid for was spendy.

[robcycle]

Yup, drilled cogs work. I got a disc wheelset for Xmas for this purpose. An Endless cog on the cassette, and a drilled Shimano DX cog on the disc side. Well, I was going to use the cog for a coaster brake but ... you wanna talk about hard steel? Brake a few files on one of those ... Anyway, I got an $8 BMX cog, drilled it, and it worked fine. Oh, I hand drilled it, and used a Ti Nitride coated bit. Worked fine.

-Rob.

[Kamikaze]

How about using something like the Endless KickAss cog, that is made of aluminum? should be easier to drill, right?

[robcycle]

How about using something like the Endless KickAss cog, that is made of aluminum? should be easier to drill, right?
The Endless cog is wider than a normal cog at the base (~6mm, I think) and I think this would throw off the chainline. Also, it slopes down to the teeth, so I wouldn't mate up very well ... Also I'm not sure I would trust aluminum in that application.

I think I would just buy the $8 cog and be done with it :p

-Rob.

[Kamikaze]

The Endless cog is wider than a normal cog at the base (~6mm, I think) and I think this would throw off the chainline. Also, it slopes down to the teeth, so I wouldn't mate up very well ... Also I'm not sure I would trust aluminum in that application.

I think I would just buy the $8 cog and be done with it :p

-Rob.

I didn't see your post before. I thought that the shape of the Endless may cause trouble -and that aluminum may be less than optimum- but figured I'd ask and see.

The other interesting thing I saw on that 63xc website was the article on using a granny ring as a cog.

[robcycle]

The other interesting thing I saw on that 63xc website was the article on using a granny ring as a cog.

Yeah, I saw that article. It was pretty cool :cool:

RIP 63xc :(

-Rob.