Viewing 22 posts - 41 through 62 (of 62 total)
  • Riding fixed without a Lock Ring
  • MrAgreeable
    Full Member

    There is another option. 🙂

    For this reason, for our conversions, we weld the cog and lockring onto the hub, so that when you stop, your cog wont pop off! In our experience, the welded conversion is just as safe as a track hub; neither one has ever broken that we know of. However, if you plan on riding without a front brake, we recommend using a track wheel just to be sure.

    joemarshall
    Free Member

    I know of people who've broken welded cogs. Although it was on chain driven unicycles (way larger forces than on a bike) and by all reports they lasted quite long.

    Joe

    crazy-legs
    Full Member

    we weld the cog and lockring onto the hub

    Total pain if you ever want to change your cog!

    MrAgreeable
    Full Member

    Suggestion not made in all seriousness (the quote is from an advert by a business that Bikesnob called "a fixed-gear meth lab"). But I want to see if he tries it. 🙂

    WorldClassAccident
    Free Member

    The Doctors won't let me have crayons, what chance a welding torch!

    Del
    Full Member

    show them the contents of this thread and they won't let you have your liberty either – sectioned on the basis of a danger to yourself or others…

    Sam
    Full Member

    You're quite welcome to try and turn a wheel backwards while I try and ride it forwards

    That's a much more illustrative example than guess-work about crank lengths, wheel size and gear ratios. Bike in turbo with no resistance, person holding outside of wheel. Pedal away. I'd have my money on the rider every time unless the gear was massive and the tyre was grippy.

    joemarshall
    Free Member

    That's a much more illustrative example than guess-work about crank lengths, wheel size and gear ratios. Bike in turbo with no resistance, person holding outside of wheel. Pedal away. I'd have my money on the rider every time unless the gear was massive and the tyre was grippy.

    Yeah probably so. If that is the case, then it's an interesting demonstration that the bike allows you to put more than 4 times as much power through your legs than just using your arms alone. Although it does depend a lot on the gearing, and these track bikes do tend to have very high gears no?

    Thinking about it, you could modify the wheel turning method by putting the bike on the ground and pushing it forwards. I imagine you could put quite a large amount of force on then – if someone stands and pushes backwards on your handlebars as hard as possible, can you make the bike move forwards, or do you get moved backwards? That'd be a kind of fair comparison, I've never tried that either.

    Joe

    UpQuickDownSlow
    Full Member

    Your cranks are 170mm, compared to a 311mm radius wheel, which is 1.8 times the leverage. Then you're going through a gearing system, say if you're using a 70 inch gear, that's another 2.5 times the leverage. Using the wheel as a lever, you'd have a total of 4.6 times the amount of force. Are your legs really capable of applying 4 and a half times as much force as your arms? That may be true, although I'm not 100% sure of it. Using your arms would have a bonus in that it would be a nice smooth application of force, so you're much less likely to break things either – like when you use a scaffold pipe to remove stuck cranks, it always seems much less bad for them than using a hammer on the allen key.

    I think the 70 inch gear = 2.5 times the leverage bit is wrong. You need a smaller chainring to get more torque. A bigger gear amplifies distance travelled, not force.

    I'm pretty sure that the rider on rollers on a fixie would not be able to turn the wheel if someone is holding it. But the rider will be able to stand on the pedal and get his whole weight on it, so will have more force than you can get through your arms. Someone needs to test it!

    ro222
    Free Member

    I don't run a lock ring. Just used a chain and a bit of wood to tighten the sproket on to the hub and away. Been running ok around town for the last year ok.

    Stoner
    Free Member

    I reckon I could hold a wheel quite easily on a roller while sam tried to pedal away from a standing start.

    WorldClassAccident
    Free Member

    and I have successfully pushed someone backwards down the road while they were trying to ride forwards.

    Does this mean I will or won't die when I ride the flaming bike?

    It is getting late and at this rate I will be using the cock ring before the lock ring.

    😉

    tomlevell
    Full Member

    I don't run a lock ring. Just used a chain and a bit of wood to tighten the sproket on to the hub and away. Been running ok around town for the last year ok.

    But how do you ride?
    Skip stops, skids, slowing with back pressure etc or do you mostly use the back brake?

    Offroad is a totally different kettle of frogs with the far lower gear, steeper downs and varying grip.

    I've undone cogs that have been on my fixed for a thousand miles by taking the lockring off and riding round the road and slowing down rapidly with my legs.

    WorldClassAccident
    Free Member

    Tom – I am not planning to skid by pedalling backwards or anything clever like that. I reckon speeding up and gently slowing down will all the pedals will be used for. The occasional unexpected down hilly bit I guess but it is the south of England, Swinley will be as severe as it gets.

    Are you saying off road without lock ring is okay?

    simondbarnes
    Full Member

    I happily[1] ran fixed offroad for a few rides without a lockring.

    [1]OK, that's a lie, it was shit.

    WorldClassAccident
    Free Member

    It adds interest to the New Forest, just don't want to wreck a Phil Woods hub

    tomlevell
    Full Member

    As I said before JDI.
    I'm sure it'll be fine as there are no downhills in the south anyway.

    thomthumb
    Free Member

    get some loctite – strong stuff.

    trail_rat
    Free Member

    he clearly just wants us to back him up …. hes not gettting a lockring is he …

    let him do it , then wait for the thread " **** my hub "

    john_l
    Free Member

    You WILL want to do skips 'n skidz 'n stuff & then it WILL come undone, trust me.

    samuri
    Free Member

    But the rider will be able to stand on the pedal and get his whole weight on it

    And the rider will be able to pull on the bars, dunno how much extra force that adds. The person standing in front of the bike is an entirely different proposition. There's all the additional factors of that persons's weight and the friction of their feet on the ground.

    samuri
    Free Member

    take the advice of some very experienced fixie riders WCA, at best you'll undo the cog and die, at worst you'll knacker your hub.

Viewing 22 posts - 41 through 62 (of 62 total)

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