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Locking up a cassette free hub for use on a fixed gear

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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

Locking up a cassette free hub for use on a fixed gear

Old 01-21-13, 07:00 PM
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deuce808
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Locking up a cassette free hub for use on a fixed gear

I have an idea to use a sram s80 with its road hub on a fixed gear.

1. Lock up the pawls using either hard plastic or metal shims. Place behind the pawl where the leaf spring would be. Would this be sufficient? I did a test run and it does keep the hub from freewheeling.

2. Using the s80s oversized axles so I wouldn't need to change bearings. I would need to cut down to a appropriate width. I'm thinking 2mm inside of the outter bearing on each side, then drill out the center (because its stepped down for a skewer) to allow a normal threaded track axle to slide through. Cone nuts would be used on either end to tension correctly and spacers will be used to make up any difference.

3. Cassette spacers and a splined track cog would be used to complete the set up.

In theory this would be used to allow for the beautiful wide blades spokes and sram hub to be retained while allowing use as a fixed gear wheel. Any feedback or suggestions. I know I can just lace it to a philwood and be done but I'm thinking that since this is reversible (with a replacement axle) then it would allow me to run it on a road bike later if need arises. Anyone think it will hold up? The shims in the hub? I don't skid aside from hop skids at sub 20mph speeds and run a brake if that helps.

Please let me know. Pondering about trying this while waiting on a philwood hub.

Thanks
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Old 01-21-13, 07:18 PM
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This is like the fourth thread you've started about your S80's. Hate to burst your bubble, but I think it's become clear that you're way over your head. Either go to your LBS and have things done right or scrap this ill-advised idea.

They make certain things to work in certain situations for a reason. If you can afford A.) a set of S80's and B.) the money it would take to make these hypothetical modifications, you can afford C.) a decent fixed wheelset. That way, you don't ruin your sw8 crabon and can still run them on your road bike when you want. Boom.
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Old 01-21-13, 07:19 PM
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Surly Fixxer. Google it.
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Old 01-21-13, 07:20 PM
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surly fuxxers wont work on newer pawl internals. they only work for bolt on shimano freehubs
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Old 01-21-13, 07:21 PM
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Then you're **** out of luck.

See post #2.
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Old 01-21-13, 07:26 PM
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if you dont know the answer dont assume that i am over my head. i have been a motorcycle mechanic for over 15yrs, i also have extensive (over 19yrs) experience in plumbing and contracting. i like to tinker with stuff and explore the options out there. i know that you can just get a track hub. that is the easy simple way. i am appealing to the other mechanics and thinkers out there who like to go outside the box. if it wasnt for people that thought that there may be another way we might as well all be sheep.

what is so ill advised? the weakest point would be the shims behind the pawls. as long as that material can handle the pawls pressing against them when/if you try to halt rotation of the wheel then that should be ok. the track axle inside the oversized axle will act just as a skewer would but with nutted ends to be more secure. cassette spacers and splined cogs have been used for years to convert multispeed bikes to single speed. so please show me where i am flawed in this thinking? if you dont think outside the box then refrain from answering, if i need a baaaa answer ill go ask the other sheep.
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Old 01-21-13, 07:29 PM
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Originally Posted by deuce808 View Post
if you dont know the answer dont assume that i am over my head. i have been a motorcycle mechanic for over 15yrs, i also have extensive (over 19yrs) experience in plumbing and contracting.
None of this means **** when it comes to bicycles. One of my best friends has been a motorcycle mechanic for many years but would most likely be scratching his head if I said "Hey, replace my headset and bottom bracket".

If you butt is getting sore here, maybe you should ask for advice in the mechanics forum (where your question belongs) and see what they have to say.
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Old 01-21-13, 07:32 PM
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You just spoke to two mechanics. Are you planning on using this on a road frame? If so, this only drives my point home. Innovation is cool. Sure.

But sometimes you have to cut your losses. Also, I highly doubt that the splines on your freehub can deal with the back and forth torsional force that a fixed gear would cause. I say highly because I've never seen anyone actually go past the point of theorizing about this and decide it was a good idea.The only way I see this ending for you is you with one royally ****ed up wheel that you spent lots on and will have no resale value.

Baaaa ****ing baaaa.
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Old 01-21-13, 07:34 PM
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again assuming...why dont you get past yourself. i have work on bikes since childhood, the other stuff was to ensure my mechanical ability. btw even without that background it doesnt take einstien to work on bikes. basic understanding of mechanics and theory is all it takes.

so lets drop this little arguement and i put it out there to the people that like to THINK. any flaws to the theory? anyone tried this? i cant be the only one that has tried to think up something. someone invented the surly fixxer, theres got to me a way to do this. if a simple fix like this works then cad drawings will lead to production of real locking pawls and axle kits..........
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Old 01-21-13, 07:36 PM
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You can swing your "I'm a mechanic" wang around all day dude, I'm just giving you sensible advice.

You're also the same dude who wanted to run this configuration on a funny bike and toss a 700c fork on it, right?

If I'm recalling correctly, then I give up.
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Old 01-21-13, 07:36 PM
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Originally Posted by solipsist716 View Post
Also, I highly doubt that the splines on your freehub can deal with the back and forth torsional force that a fixed gear would cause. I say highly because I've never seen anyone actually go past the point of theorizing about this and decide it was a good idea.
+1

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Old 01-21-13, 07:37 PM
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Originally Posted by solipsist716 View Post
You're also the same dude who wanted to run this configuration on a funny bike and toss a 700c fork on it, right?

If I'm recalling correctly, then I give up.
You are correct.

Originally Posted by deuce808 View Post
why dont you get past yourself.
For the same reason you don't.

BTW - questions end with this: ?
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Old 01-21-13, 07:38 PM
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Old 01-21-13, 07:39 PM
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Originally Posted by Scrodzilla View Post
BTW - questions end with this: ha?
ftfy
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Old 01-21-13, 07:39 PM
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this would be on a track frame. thus the shortening of the axle and using a inner/nutted axle to secire the wheel to the bike. the outter spacers for the skewer give it the 130mm spacing for road, removing them + the mods to the oem axle will give the necessary spacing of 120mm

waiting for the ones who have theorized this to chime in.

if the splines go, then a new hub body can be purchased to replace it, same with the pawls. if the hub itself breaks then that can be purchased as well or just swap out to a philwood for a track wheel. only way this would royally mess up the wheel is if the carbon cracked, then i can see it as a total loss. all parts that are modified can be returned to oem or replaced to go back to road.
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Old 01-21-13, 07:40 PM
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it was rhetorical...i dont need a answer cuz i already knew you wouldnt. it was a out to continue this discussion with intelligence
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Old 01-21-13, 07:40 PM
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Originally Posted by deuce808 View Post
waiting for the ones who have theorized this to chime in.
You'll be here for a while
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Old 01-21-13, 07:41 PM
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Originally Posted by deuce808 View Post
it was a out to continue this discussion with intelligence
So far, you've only displayed the opposite.

Again, ask in the mechanics forum.
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Old 01-21-13, 07:42 PM
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so aside from the sheep...can anyone appreciate innovation? someone has to have thought about this before. lets compare theory and see if we can make it work.
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Old 01-21-13, 07:44 PM
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finally a decent answer. thanks. although you couldve just pointed me in that direction from the start.
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Old 01-21-13, 07:47 PM
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Originally Posted by deuce808 View Post
finally a decent answer. thanks. although you couldve just pointed me in that direction from the start.
You mean like I did in post #7?
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Old 01-21-13, 07:48 PM
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Originally Posted by deuce808 View Post
finally a decent answer. thanks. although you couldve just pointed me in that direction from the start.
You mean like....

Originally Posted by Scrodzilla View Post
If you butt is getting sore here, maybe you should ask for advice in the mechanics forum (where your question belongs) and see what they have to say.
Right there? ^
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Old 01-21-13, 07:48 PM
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as for the funny bike thing i dint not account for the rake being changed from the fork swap and that like anything else was just a question. im sure alot of others have thought the same thing.
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Old 01-21-13, 07:50 PM
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we can go back n forth all day like this. makes no difference to me. talk is talk on the internet, you can flame all you like and ill still ask my questions. theres nothing you can do to stop that.

once again...anyone out there have thoughts on this?
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Old 01-21-13, 07:50 PM
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Originally Posted by deuce808 View Post
as for the funny bike thing i dint not account for the rake being changed from the fork swap and that like anything else was just a question.
You're definitely someone I'd want working on my motorcycle.
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