Davetrials Posted January 15, 2005 Report Share Posted January 15, 2005 Well recently at halfords i broke a kiddies bike so i had to take the back wheel off, only to notice the fixed cog(usually on 12" bikes) can screw off :ermm: They cum in loadsa sizes, ive seen 12-16-18-19-20-21 Go to your local tip, find a kiddes bike steal the wheel, rip i apart jam the hub ina vice and wack a chain wip around the cog :huh: Saved your self £15-20 ^_^ Quote Link to comment Share on other sites More sharing options...
nb88 Posted January 15, 2005 Report Share Posted January 15, 2005 (edited) Gonna phone up my lbs see if they sell any ^_^ cheers for the tip :ermm: Just phoned em and they sell em for about £6.99, sorted ^_^ :huh: . He said theyre 1/8" though (for wider chains) - which should be better as i run a kmc cool anyway. Edited January 15, 2005 by Nozmeister Quote Link to comment Share on other sites More sharing options...
eMAyaRKay Posted January 15, 2005 Report Share Posted January 15, 2005 What are they made of though? Wouldn't it be a weaker metal as they are built for kiddies bikes and dont require the strength that trials riders need for kicking the cranks round fast and hard? I'm sure in time (and not too much) they would just simply snap. Quote Link to comment Share on other sites More sharing options...
nb88 Posted January 15, 2005 Report Share Posted January 15, 2005 My lbs gave me a freewheel thinking it was a fixed cog! ^_^ d'oh! I'll probably buy one from tartybikes for £18. :turned: Quote Link to comment Share on other sites More sharing options...
Swindon rider Posted January 15, 2005 Report Share Posted January 15, 2005 What are they made of though? Wouldn't it be a weaker metal as they are built for kiddies bikes and dont require the strength that trials riders need for kicking the cranks round fast and hard? I'm sure in time (and not too much) they would just simply snap. ← Well no because the cogs we use are just road bike track cogs, but labled up 3x the price ^_^ Stu Quote Link to comment Share on other sites More sharing options...
Burton Posted January 15, 2005 Report Share Posted January 15, 2005 Well no because the cogs we use are just road bike track cogs, but labled up 3x the price :o Stu ← BUT arent the monty, koxx and echo uns different to yours(material wise)? and what would snap on them? Teeth? cos i thought theyd be cheap&steel if this is true, theyd be less prone to bending :o :"> just a little theory........ Quote Link to comment Share on other sites More sharing options...
lil james 2 Posted January 16, 2005 Report Share Posted January 16, 2005 yer but i think the specific trials ones have more threads closer together, this will stop the pressure from trialsin rippin the thread from the cog or something else :o . Quote Link to comment Share on other sites More sharing options...
Janson Posted January 16, 2005 Report Share Posted January 16, 2005 But then it wouldn't fit on the hub if the thread was different? Quote Link to comment Share on other sites More sharing options...
lil james 2 Posted January 16, 2005 Report Share Posted January 16, 2005 But then it wouldn't fit on the hub if the thread was different? ← thats what i read on a site....trialsinusa.com....it was talking about echo trak cogs having closer threads.....copy: 12 tooth are the standard for the rear of front freewheel mod bikes. If you are using front freewheel cranks, but want to use cassette type rear hub then the 18 tooth is the choice for you. Always grease the threads (preferably lithium grease) before installing. Also, if you are looking at another brand of cog (like off the shelf track cogs) MAKE SURE there are plenty of threads! We have seen more than one stripped crank and hub due to sprockets not having enough threads to handle the force of of trials riders.. ??? :o Quote Link to comment Share on other sites More sharing options...
Dai the Socket Posted January 16, 2005 Report Share Posted January 16, 2005 Where can i get a 13t rear fixed cog for my mod..... My gearings too hard lol..... (Y) Quote Link to comment Share on other sites More sharing options...
JTM Posted January 16, 2005 Report Share Posted January 16, 2005 thats what i read on a site....trialsinusa.com....it was talking about echo trak cogs having closer threads.....copy: 12 tooth are the standard for the rear of front freewheel mod bikes. If you are using front freewheel cranks, but want to use cassette type rear hub then the 18 tooth is the choice for you. Always grease the threads (preferably lithium grease) before installing. Also, if you are looking at another brand of cog (like off the shelf track cogs) MAKE SURE there are plenty of threads! We have seen more than one stripped crank and hub due to sprockets not having enough threads to handle the force of of trials riders.. ??? :o ← That refers to the width of the overall cog, as in how many threads there are, not how big each thread is Quote Link to comment Share on other sites More sharing options...
Lee_Buchanan Posted January 16, 2005 Report Share Posted January 16, 2005 (edited) Yer dave has the right idea You can go to the skips and pick up small fixed cogs for free off old kids bikes,and take them of them,Some of my freinds have done it in the past for their bmxs to run them with a small cog. Tis good thinking. Lee Edited January 16, 2005 by Mr Koxx Quote Link to comment Share on other sites More sharing options...
montybiketrial Posted January 16, 2005 Report Share Posted January 16, 2005 Or you could fill the freewheel in with some good ol' tig weld.... Quote Link to comment Share on other sites More sharing options...
Swindon rider Posted January 16, 2005 Report Share Posted January 16, 2005 What a 12t freewheel :o, The fixed cogs, are exactly the same as road bike track cogs, same dimensions, same material, etc. Echo, Monty, Koxx, etc are just road bike track cogs rebadged! Like ive already said Stu Quote Link to comment Share on other sites More sharing options...
Swindon rider Posted January 16, 2005 Report Share Posted January 16, 2005 (edited) EDIT: oops :"> Edited January 16, 2005 by Swindon rider Quote Link to comment Share on other sites More sharing options...
stuntsbyjon Posted January 16, 2005 Report Share Posted January 16, 2005 Hhhhmm, so if I wanted to run a single speed on the rear of my stock, what size would you all recomend for that? (Y) Think I may be confused again... :o Quote Link to comment Share on other sites More sharing options...
JoShO Posted January 19, 2005 Report Share Posted January 19, 2005 I think there talking about mods. Josh Quote Link to comment Share on other sites More sharing options...
andyroo Posted January 19, 2005 Report Share Posted January 19, 2005 (edited) The Onza 12 tooth fixed sprocket I had got slightly bent on each tooth due to the effect of trials, but when I got a new wheel, I put a Monty sprocket on it, and the chain doesnt even leave a mark on that one. I'm more inclined to think that the quality of the sprocket on the kids bikes are not dissimilar to that of the onza sprocket, which would mean a Monty one, for example, would be better quality, and stronger. So na! :blink: Edited January 19, 2005 by andyroo Quote Link to comment Share on other sites More sharing options...
Tartridge Posted January 19, 2005 Report Share Posted January 19, 2005 The Onza 12 tooth fixed sprocket I had got slightly bent on each tooth due to the effect of trials, but when I got a new wheel, I put a Monty sprocket on it, and the chain doesnt even leave a mark on that one. ← Did you get a new chain at the same time as fitting the new sprocket? Quote Link to comment Share on other sites More sharing options...
Bionic Balls Posted January 19, 2005 Report Share Posted January 19, 2005 Onza sprocket £12...monty £20- you can't really tell the difference (my onza was fine after a year) and you really cannot justify spending £20 on something so pathetic! well maybe you can- it is essential.. adam Quote Link to comment Share on other sites More sharing options...
Michael Hardman Posted January 19, 2005 Report Share Posted January 19, 2005 For such a small piece of metail its shocking what companys charge, but hey thats capitalism for you. I just boughtt he echeapest I could find, which was £18 (obviously didnt look hard enough) Quote Link to comment Share on other sites More sharing options...
andyroo Posted January 19, 2005 Report Share Posted January 19, 2005 Did you get a new chain at the same time as fitting the new sprocket? ← Er... no... Why!? :blink: Quote Link to comment Share on other sites More sharing options...
Tartridge Posted January 19, 2005 Report Share Posted January 19, 2005 Just wondering, because a stretched chain wears sprockets faster than a new one. Also, the Monty sprockets are thicker than the Onza ones, which could account for your findings. Quote Link to comment Share on other sites More sharing options...
andyroo Posted January 19, 2005 Report Share Posted January 19, 2005 My point exactly, being thicker, it muct obviously be of overall better quality than a cheap kiddies bike one. The chain is a relatively new KMC Kool thin, the bb's too big anyway so it runs at a funny angle, so if its gonna do anything, it sould have done it by now... I hope. :blink:" Quote Link to comment Share on other sites More sharing options...
Tartridge Posted January 19, 2005 Report Share Posted January 19, 2005 My point exactly, being thicker, it muct obviously be of overall better quality ← How does that makes sense? It means its heavier, so :( Must be crap :blink: Kidding, but you get my point... We've had a few problems with people not being able to fit KMC Kool thin chains onto Monty sprockets, so, dunno whats going on there! :S Quote Link to comment Share on other sites More sharing options...
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