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langster gearing

Discussion in 'Fixed Gear and Single Speed' started by gkerr4, 2 May 2008.

  1. gkerr4

    gkerr4 New Member

    Location:
    Blackpool
    Hi folks - i have a 2007 langster in the much loved 'rust' colour (no laughing at the back - i like it - thats all that matters!)

    it currently has standard gearing - which is the sugino 'comp' chainset with a cnc 'zen' 42 tooth chainset with a 16 tooth fixed cog at the back.

    ordinarily this would be fine - but i've buggered up my left knee and need arthroscopy on it to repair / remove a torn meniscus (cartilage injury). I've been advised by the consultant that I can continue cycling if it doesn't cause any pain - which so far seems to be ok - with the proviso that I "don't go daft with it.." i have a surgery date of the 10th of July which seems ages away and if I don't cycle I will turn into a fat bloater.

    anyway - i've been avoiding the fixed due to the lack of gear changing since I found out about the injury bu I really miss it so I was thinking of lowering the gearing. I'm not sure though on the technicalities

    - is the sugino comp a 130BCD chainset or is it a 'proper' track 144BCD?

    and also what would be the bet way of lowering it a little - increase the sprocket to an 18 or 19 tooth? - or go to a 40(ish) chainring?

    Any help appreciated - even if you just think I should leave the fixed alone for a bit... :-(

    thanks
    graham
     
  2. zimzum42

    zimzum42 Legendary Member

    [/sitting at back with Peejay]snicker snicker[sitting at back with Peejay]
     
  3. OP
    OP
    gkerr4

    gkerr4 New Member

    Location:
    Blackpool
    oh god - it's started already and i haven't even got an answer on the gearing..

    :-)
     
  4. zimzum42

    zimzum42 Legendary Member

    had you got a nice bike you would have been happier, therefore less susceptible to injury, and this would not have been a problem ;)
     
  5. Christopher

    Christopher Über Member

    ZZ42 you really are a complete waste of space.:rolleyes:

    Right. Either way you'll need to add or remove links to the chain. Ribble sell track chains for a fiver. I have some 1/8" spare links (5 or 6) that you can have, but I'm off on 10 days hols this afternoon, back here 13th May.

    To change the rear sprocket on a fixed, you will need a lockring spanner (like the Hozan one Planet-X sell - costs £18 but will last for ever) and a chainwhip. As it's an American bike, probably everything will be done up gorilla tight.

    For the front, you do need the BCD, doubt it's 144mm as I don't think you can do a 42t chainring in 144mm. The BCD might be written in tiny letters on the chainring, have a look. Anyway Spa cycles do 1/8" chainrings in just about every BCD there is, so think about ordering from there. Hewitt in Leyland have a stack of rings on the wall, you might think about going there. Once you have the new chainring then all you need is an Allen key and possibly a spanner to stop the chainring bolt sleeve from rotating.

    Formula for gear inches is (Chainring/sprocket)*26.4, roughly, so you are doing 69 inches currently. 39/16 is 64 inches etc.

    It would be cheaper to change the rear, but you need more tools. I have all the tools listed above, let me know if you can wait until I am back and I'll happily meet up and change the sprocket for you. You can have the links anyway...
     
  6. OP
    OP
    gkerr4

    gkerr4 New Member

    Location:
    Blackpool
    wow - how good is that - thanks for the info and offers of help / parts - very kind of you sir.

    I don't mind getting the tools though - I have a fairly good toolset for my geared bikes - which I have both shimano and campag bikes - But other than change the bars and saddle i haven't done a lot of work on the langster yet so was unsure of what was required.

    I'll check the chainring tonight when I get back from work.


    Thanks again,

    Graham
     
  7. Landslide

    Landslide Rare Migrant

    Location:
    Called to the bar
    Hi Graham, hope the surgery goes well and you're back in action soon.

    Re: your injury, I suspect it might be worth getting some more specialist advice. Lowering your gear ratio will mean you're putting less force into getting moving (probably a good thing for your knee), but once you're up to speed, your cadence will be higher for a given speed. I'd wonder if having your legs spin round more for a given distance would be a good thing?
    I'm no expert in these matters, but I suspect an expert opinion would be a good thing.
     
  8. MrGrumpy

    MrGrumpy Huge Member

    Location:
    Fly Fifer
    gkerr4

    I`ve had the same operation done a few years back however if your still mobile your doing a damm sight better than me as I couldn`t straighten my leg :ohmy: Anyway the cyling will really make a differance to your recovery but I think you would be better riding your geared bike on nice spinny gears, you don`t want to strain that knee joint :ohmy:
     
  9. OP
    OP
    gkerr4

    gkerr4 New Member

    Location:
    Blackpool
    you are probably right :-(

    I am still mobile yes - it kind of locks up a bit and hurts coming down the stairs. I can't kneel down or bend my leg properly - but it actually feels good on the bike - it's the walking and standing about in between that hurts it.

    I'l stick with the geared bike i think - as you say, it'll allow me to keep the cadence at a sensible rate.

    thanks guys!
     
  10. zimzum42

    zimzum42 Legendary Member

    If you'd been on the forum for longer than ten minutes you might know the background, but never mind.......
     
  11. MrGrumpy

    MrGrumpy Huge Member

    Location:
    Fly Fifer
    speaking of which, wheres your sidekick the other infamous langster lover :smile:
     
  12. zimzum42

    zimzum42 Legendary Member

    I reckon Peejay bought an extra rusty langster and got lost riding round Hoxton
     
  13. OP
    OP
    gkerr4

    gkerr4 New Member

    Location:
    Blackpool
    yeah - he'll be far too busy trying to get a good part-ex on his collection of rusty-steel things against a london-langster to read this

    :-)
     
  14. zimzum42

    zimzum42 Legendary Member

    i think i saw him locking up outside that pub off grays inn road
     
  15. peejay78

    peejay78 Well-Known Member

    frustruck got real cross and pious there for a minute.

    i have a sugino 75, i know it's not a 42 or whatever, but for what it's worth the bcd is 144.

    i'm fairly sure yours is a 130 bcd.

    i would strongly recommend you change the back, it's much much cheaper. you can even go as big as 22.

    PLUS changing the back has a more significant effect than the front.

    speaking of rusty steel, here's one i shelled out for earlier:

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