Concussion Posted February 28, 2006 Report Share Posted February 28, 2006 Well..... last night this idea somehow popped into my head and as it's freezing today, I thought I'd Photoshop-up the idea.I was thinking how it would be with a fixed sprocket on the front and back (I'm still kinda into that idea...it would be er` interesting!). Realizing the need to `coast` I thought why not put the ratchet/pawl mechanism on the outside of the wheel? So I came up with A then modified it a bit to get B...I hope my scribbles are clear enough!Christ knows how many pawls/engagement points it would have and I imagine the weight would be a problem....and all the rest! OK, that's me done........ just interested in what you guys think? PS: I know there are already hubs doing this job perfectly well.....just humor me or somethin! Quote Link to comment Share on other sites More sharing options...
spunkey_monkey_boy Posted February 28, 2006 Report Share Posted February 28, 2006 brakes? Quote Link to comment Share on other sites More sharing options...
ogre Posted February 28, 2006 Report Share Posted February 28, 2006 brakes?If you lok at the diagram, you can see that one rim clamps onto the other, btw wouldn't this thing weight a ton? Quote Link to comment Share on other sites More sharing options...
Krisboats Posted February 28, 2006 Report Share Posted February 28, 2006 The barings would also ahve to be pretty damn strong to stand up to the forces of all the body weight of the rider landing on the rear wheel. It is a very good idea though, good to see someone's thinking about possible future bike parts. Quote Link to comment Share on other sites More sharing options...
Jsy Ben Posted February 28, 2006 Report Share Posted February 28, 2006 well, very good idea certainly something i imagine never has beeen thought of before...i didnt get it at first, but happy now an extra rim and some pawls wouldnt be too heavy...but a big rachet around the whole rim, thats were it gets heavy !i like the idea all the same though, complicated but inventive...thinking out side the box *goes to add reply* butwoh brainwave: since you would have basically the hub internals inside your rim...you wouldnt need the internals inside your hub! smaller hub+more support,bigger axle and all of a sudden the wheel doesnt seem that heavy Quote Link to comment Share on other sites More sharing options...
Krisboats Posted February 28, 2006 Report Share Posted February 28, 2006 (edited) Hell why not just take the hub out all together? If you fixed the outside rim part to your frame you would have a fixed outer rim with a spinning innner one, this would mean you could lose the weith of the hub, axle spokes and everything. Now someone else think of how you can fit a brake to this and how you can get the wheel to turn seeing as theirs no longer a rear sprocket. My idea seems a bit pants now. Eidt: oooh no fix the inner part of the rim to the frame and then the outside bit will spin and you can run a normal rim brake again. Now for a method of getting it to turn. Edited February 28, 2006 by Krisboats Quote Link to comment Share on other sites More sharing options...
Concussion Posted February 28, 2006 Author Report Share Posted February 28, 2006 brakes?If I can figure out some internal locking device, that would lock the rims, producing a brake effect...also eliminating the current rear brake set-up Dang...it's just coming to me!If you lok at the diagram, you can see that one rim clamps onto the other, btw wouldn't this thing weight a ton?Yes.....but see above about brake The barings would also ahve to be pretty damn strong to stand up to the forces of all the body weight of the rider landing on the rear wheel. It is a very good idea though, good to see someone's thinking about possible future bike parts. Cheers woh brainwave: since you would have basically the hub internals inside your rim...you wouldnt need the internals inside your hub! smaller hub+more support,bigger axle and all of a sudden the wheel doesnt seem that heavy Totally, and thanks Hell why not just take the hub out all together? If you fixed the outside rim part to your frame you would have a fixed outer rim with a spinning innner one, this would mean you could lose the weith of the hub, axle spokes and everything. Now someone else think of how you can fit a brake to this and how you can get the wheel to turn seeing as theirs no longer a rear sprocket. My idea seems a bit pants now. Eidt: oooh no fix the inner part of the rim to the frame and then the outside bit will spin and you can run a normal rim brake again. Now for a method of getting it to turn.Christ...let me think about that? Quote Link to comment Share on other sites More sharing options...
Krisboats Posted February 28, 2006 Report Share Posted February 28, 2006 i think i have an idea, may need some improvement though, and maybe needs to be made trials proof, but there'd be no more broken mech hangers! Quote Link to comment Share on other sites More sharing options...
Concussion Posted February 28, 2006 Author Report Share Posted February 28, 2006 That's wild! Quote Link to comment Share on other sites More sharing options...
CurtisRider Posted February 28, 2006 Report Share Posted February 28, 2006 go sit in the corner , the both of you nah its cool you've tried, in practise i dont think it would be very sucessful, kris your idea is funnily stupid, i love it, i think the rim may suffer flatspots, and imagine the force on that 'thing' that holds the wheel on-haha Quote Link to comment Share on other sites More sharing options...
mat hudson Posted February 28, 2006 Report Share Posted February 28, 2006 it would need to be suported on both sides. plus."oh noes" i have dentted my rim "oh noes" now i've shagged my drivetrain Quote Link to comment Share on other sites More sharing options...
Dan Clark Posted February 28, 2006 Report Share Posted February 28, 2006 What happens when the wheel buckles or flat spots, sure everything goes to shiz then? Quote Link to comment Share on other sites More sharing options...
ScotchDave Posted February 28, 2006 Report Share Posted February 28, 2006 Do any of you have any idea how heavy a rim would have to be to cope without spokes??? Quote Link to comment Share on other sites More sharing options...
Mark W Posted February 28, 2006 Report Share Posted February 28, 2006 I really hope you weren't suggesting some kind of back-pedal brake system, like with the coaster hubs? Anyways, if you had a sideways impact on the wheel, a normal wheel would flex and mean most of that play would be eliminated before it reached the hub. However, if you've got the rim-in-rim situation, it's going to twist that, meaning it'd mess the drivetrain up? Also, you'd have to have more pawls to make it stable, and a load of needle bearings too to try and stop any torsion and flex between the rims. And as people said, to make the wheel strong enough to withstand buckling which would totally ruin your system, it'd have to be a beast Quote Link to comment Share on other sites More sharing options...
Phatmike Posted February 28, 2006 Report Share Posted February 28, 2006 Orbital Wheel - need I say more? Would certainly be interesting! Quote Link to comment Share on other sites More sharing options...
Alun Goch Posted February 28, 2006 Report Share Posted February 28, 2006 As the brake would act on the outside rim, wouldn't the tyre and inner rim still be free to move in one direction due to it not being fixed? Nice thought though, there's got to be something radical like this that would better trials bikes somewhere.Alun Quote Link to comment Share on other sites More sharing options...
Krisboats Posted February 28, 2006 Report Share Posted February 28, 2006 Do any of you have any idea how heavy a rim would have to be to cope without spokes??? This is a completely wild guess but i would imagine that lets say 900 grams for the rim and spokes don't weigh too much so i'd sayabout 300grams for them, in total thats about 1200 grams isn't it? (i'm not really being serious but its as good a guess as i could think of)I even made this earlier to show my idea a bit better. I even went into how it'd need a small rear sprocket attached to a larger drivetrain cog. I was even trying to complicate things even more by trying to figure out how it could be run so that it had gears! Anyway here's the picture. This wasn't meant to be a serious thing.... I don't think anyone would try to make this to see if it would work for trials, just imagine how wide you could make the rear rim though so you could fit a massive tyre on. And i don't know how most of you didn't notice the biggest flaw..... as of yet in these ideas we have no way of being able to get the wheel out to replace the tyre or fit a new inner tube, and there you lot all were moaning about how it wouldn't be strong enough, you can't even replace the damn tyre!! I reckon when someday bikes evolve to be more like this i'll be there saying "i fookin said it didn't i? hah, now who thinks its a bad idea!" Quote Link to comment Share on other sites More sharing options...
andyroo Posted March 1, 2006 Report Share Posted March 1, 2006 What about a bottom bracket that comes combined with freewheel? Like how echp has stuck some big bearing on the outside of their new bb, why not use that to put in a ratchet and pawl system too?Hmm... Quote Link to comment Share on other sites More sharing options...
Brian Bleech Posted March 1, 2006 Report Share Posted March 1, 2006 this topic is silly , but cool What about a bottom bracket that comes combined with freewheel? Like how echp has stuck some big bearing on the outside of their new bb, why not use that to put in a ratchet and pawl system too?Hmm... bmx sized bb, with internal freehub or something that would be good .. maybe Quote Link to comment Share on other sites More sharing options...
Will Arnold Posted March 1, 2006 Report Share Posted March 1, 2006 lets face it, a well serviced king or similar is all thats needed its light and functional.... Quote Link to comment Share on other sites More sharing options...
PaRtZ Posted March 1, 2006 Report Share Posted March 1, 2006 I think its a great idea, but probably not worth whileWhen I first looked I thought, "why not have the wheel built as normal, with the outer rim shizzle ontop?"So your fixed cog wheel built as normal, but then a layer of bearings and the outer rim on top?Meh my thoughts, think it would be good, just not for trials Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.