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Thread: Fixed Disc Cogs

  1. #1
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    Fixed Disc Cogs

    I know this has probably been beaten to death but I can not find it for the life of me. Is there a company who makes the bolt on disc hub cogs pre-drilled? I don't have a drill-press or even a drill so I am not going to attempt to make one myself.

    Thanks,
    LGO

  2. #2
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    I'm not exactly a 'company', more of a guy with access to the equipment and knowhow....but I think I got what you need:

    tomicogs

    Just finished cutting a fresh batch of blanks today, so I'll have a small inventory again, about 10-12 of each size.

  3. #3
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    Quote Originally Posted by tomimcmillar
    I'm not exactly a 'company', more of a guy with access to the equipment and knowhow....but I think I got what you need:

    tomicogs

    Just finished cutting a fresh batch of blanks today, so I'll have a small inventory again, about 10-12 of each size.
    PS - They're dreamy.
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  4. #4
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    Currently the only ones available right now (that I know of). Fortunately they work well!

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    Hey Mr Tomicog. when using one of your cogs, how often does chainline work with no fuss? I have a Redline MC 29er if it is a bike to bike thing.

    Thanks, love your cogs!!

    Quote Originally Posted by tomimcmillar
    I'm not exactly a 'company', more of a guy with access to the equipment and knowhow....but I think I got what you need:

    tomicogs

    Just finished cutting a fresh batch of blanks today, so I'll have a small inventory again, about 10-12 of each size.

  6. #6
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    Quote Originally Posted by alpka
    Hey Mr Tomicog. when using one of your cogs, how often does chainline work with no fuss? I have a Redline MC 29er if it is a bike to bike thing.

    Thanks, love your cogs!!
    Personally, it's worked fine for me, no fuss. Bolt it up flip it & go. It may not be perfect if you're using calipers to dial it in, but it lines up well enough. I haven't had any problems with a ring in the middle position. Worst case would be to run the ring in the outer position and space out the cog with a some slim washers or shim as req'd.

  7. #7
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    Thanks

    Hey, so from your blogspot, you not only ride fixed but race fixed, eh? Hmmm.

  8. #8
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    Quote Originally Posted by alpka
    Hey, so from your blogspot, you not only ride fixed but race fixed, eh? Hmmm.
    Tomi even sleeps fixed.
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  9. #9
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    About chainline, this is a On-One Inbred 29er with stock wheels. Bolted tomicog onto the disc side and chainline is less than 1mm off from the FW. I can flip flop the wheel and it works perfectly.



    Get youself one!


    No chainline trouble, even when mucked up!
    "The physician heals, Nature makes well" - real fortune cookie

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  10. #10
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    Just went on my first Tomi Cog ride today - Awesome - All I can say. How else can you expirence a totally new way of riding without buying another bike.

    Thanks Tomi

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    I have a redline monocog 29er and it works perfectly for me.

    http://bp0.blogger.com/_3hKWxStLgb0/...dline+back.jpg

    tomicog is great!

  12. #12
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    Quote Originally Posted by Marrkie
    I have a redline monocog 29er and it works perfectly for me.

    tomicog is great!
    . . . ditto!

  13. #13
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    Hi guys,

    There is a whole range of cogs and other associated items here - also a big FAQ that covers most issues:

    http://www.londonfixiebike.co.uk/

  14. #14
    bcd
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    made my life more simple

    i have some but they are not making my bike fixxie!


  15. #15
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    what the hell is that... !?
    Ibis Tranny 29


  16. #16
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    Quote Originally Posted by Mallanaga
    what the hell is that... !?
    I'm gonna take a guess...

    He's gonna use the hub as a gearbox on a FS frame. The fixed gear will either be driving the rear wheel or it will be hook by a timing chain to the cranks...

    If I think about it I think only the former makes sense. Left hand drive connected by a timing chain to the fixed side. The freewheeling side will the go to the rear wheel.

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  17. #17
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    Quote Originally Posted by Mallanaga
    what the hell is that... !?
    Creative thinking, outside the box (as the cliche goes). Like everything else bcd creates.

    TD is likely on to it, seems to me.
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  18. #18
    bcd
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    Quote Originally Posted by teamdicky
    I'm gonna take a guess...

    He's gonna use the hub as a gearbox on a FS frame. The fixed gear will either be driving the rear wheel or it will be hook by a timing chain to the cranks...

    If I think about it I think only the former makes sense. Left hand drive connected by a timing chain to the fixed side. The freewheeling side will the go to the rear wheel.

    Do I win anything?

    no prize but you are right. tomi will go to a tomi on the rear. spinning the freewheel on the alfine.

  19. #19
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    Quote Originally Posted by bcd
    no prize but you are right. tomi will go to a tomi on the rear. spinning the freewheel on the alfine.
    Damn, I was hoping for some kinda scrap carbon handmade trophy.

    Oh well. Everything is a contest to me.
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  20. #20
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    what is a gearbox? why is it on suspension bike? why why why?

    i'll throw a WTF in there too. it does look nice though...
    Ibis Tranny 29


  21. #21
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    Quote Originally Posted by Mallanaga
    what is a gearbox? why is it on suspension bike? why why why?

    i'll throw a WTF in there too. it does look nice though...
    Click a few links and look around.
    http://www.bcdracing.com/
    http://www.bcdracing.com/pics/pics.html
    http://www.bcdracing.com/psycho-bill...c/inedible.htm
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  22. #22
    bcd
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    i don't have to much on my site

    but this has a good history of gearbox bikes,

    http://www.g-boxx.org/10-bikes_history.html

  23. #23
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    Quote Originally Posted by felixdale
    Hi guys,

    There is a whole range of cogs and other associated items here - also a big FAQ that covers most issues:

    http://www.londonfixiebike.co.uk/
    Great! Another source of disc cogs! Too bad about the shallow teeth, I prefer them tall and pointy like the classic fixie cogs (helps prevent chain derailment), but I'm sure they work fine - I'd still use them.

    And they reference my article on converting a front disc hub to a rear fixie wheel - how cool is that!

  24. #24
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    ok... so it's an automatic shifter. so if you're going faster, you're automatically in the right gear. i could see why this would be good for DHers.

    interesting...
    Ibis Tranny 29


  25. #25
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    sweet

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    Hi all,

    This is Max from londonfixiebike.

    I posted a few times yesterday about my own cogs under my previous username (Felixdale). I have since deleted the duplicate text in a couple of posts - sorry for spamming it a bit.

    I have asked admin to delete my 'Felixdale' registration so I can post on here as 'londonfixiebike' to hopefully offer any tech advice.

    Tommi beat me to it in launching a nice set of cogs but hopefully we can both help in what is really a very small niche market - I guess we both decided at the same time that someone had to offer a range of stuff other than those well known elusive Ti cogs...



    itsdoable - would you be TC? That article was an inspiration to many people and still a great source of info.



    Max
    Last edited by londonfixiebike; 02-22-2008 at 02:58 PM.

  27. #27
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    Quote Originally Posted by londonfixiebike
    itsdoable - would you be TC? That article was an inspiration to many people and still a great source of info.

    Max
    That would be me. I was going to update the article, now that I'm on a converted Shimano 756 hub, but no need to now! I'm glad it got people interested - I started out by reading the 63xc article on drilling a BMX cog.
    Last edited by itsdoable; 02-22-2008 at 06:45 PM.

  28. #28
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    hah, I think that old 63xc drilling article got a lot of wheels turning.....

    Max, those are some nice looking bits you're making there.

  29. #29
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    Just ordered a tomi cog myself, figure I'll give it a try on my winter SS for those days when the conditions are too poor to ride the good trails, should make some of the easier double track around here a bit more interesting

  30. #30
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    Quote Originally Posted by Mallanaga
    ok... so it's an automatic shifter. so if you're going faster, you're automatically in the right gear. i could see why this would be good for DHers.

    interesting...
    Not from what I understand.

    I'm surprised bcd did not give the link to the gearbox thread on ride monkey. Way cool stuff.
    "The physician heals, Nature makes well" - real fortune cookie

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  31. #31
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    Going Fixed

    I just found the TomiCog, never realized this option for building a fixed gear rig. I've got a Haro Mary SS which I think will be a perfect fixy and the disc cog seems to be the simplest and cheapest means of achieving my goal. A disc cog on the single speed/disc hub which is stock on the Mary will allow me the option of flip/floping as I learn to ride fixed.

    Are there other disc cogs, other than the Tomicog?
    Happy Trails
    Jolly

  32. #32
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    Quote Originally Posted by jollybeggar
    ...Are there other disc cogs, other than the Tomicog?
    Like Tomi, I run a small business dealing in bolt-on cogs and associated parts. It's a small but growing niche!

  33. #33
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    Great website!

    Thanks! I like your product and your website is about the best I've found on the subject. How is your stock? I plan order in the next few days.


    Quote Originally Posted by londonfixiebike
    Like Tomi, I run a small business dealing in bolt-on cogs and associated parts. It's a small but growing niche!
    Happy Trails
    Jolly

  34. #34
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    Hi - thanks for the comments.

    Stock is not too hot at the moment I am afraid unless you want a 17t 1/8" or a 19t 3/32"...



    Got a bit caught out by demand of late. New stock due in a fortnight or so - please email and happy to advise.

  35. #35
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    1/8" or 3/32" ?

    I'm not sure if thickness of the cog matters, I've got an Eccentric BB so I can adjust the BB a couple of mm either way as needed.

    I keep looking thanks.

    Quote Originally Posted by londonfixiebike
    Hi - thanks for the comments.

    Stock is not too hot at the moment I am afraid unless you want a 17t 1/8" or a 19t 3/32"...



    Got a bit caught out by demand of late. New stock due in a fortnight or so - please email and happy to advise.
    Happy Trails
    Jolly

  36. #36
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    It does matter, you need to match the cog to the type of chain (width) you're using. BMX (1/8") or 8spd (3/32").

    jw


    Quote Originally Posted by jollybeggar
    I'm not sure if thickness of the cog matters, I've got an Eccentric BB so I can adjust the BB a couple of mm either way as needed.

    I keep looking thanks.
    -

    "And single-speeding 29ers are mountain biking's equivalent of Scientologists..." - Captain Dondo

  37. #37
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    Should'a thunk!

    I guess I forgot to figure that into the equation. My SS is running a BMX cog out back so it's probably 1/8", but I'll check. Thanks!


    Quote Originally Posted by GrumpyOne
    It does matter, you need to match the cog to the type of chain (width) you're using. BMX (1/8") or 8spd (3/32").

    jw
    Happy Trails
    Jolly

  38. #38
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    How about the teeth on the london fixie cogs?

    They look a bit small, no problemens with chains coming off?

    Thinking about ordering a 1/8" 19T for my road fixie (currently 47/18) and a 3/32 19T for the Monocog 29'er I'm building.

    Or just get a 17 and a 19 3/32" so I can swap them between my road fixie and mtb.
    1/8" chain on 3/32" cog works fine anyway.
    Last edited by asphaltdude; 09-19-2008 at 11:38 AM.

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