arw_86 Posted September 6, 2009 Report Share Posted September 6, 2009 (edited) basically i have bought a second hand 4jeri tensioner. and want to fit it to my bike tomo. however as i have such a small sprocket on the back if i run it the way it should be run (as in pushing the chain down to create tension) i am at risk of it skipping alot, which i dont want.so i was wondering if there is an easy way of making the tensioner want to spring up so that i could put it on the underside of the chain and therefore it would push up towards the chainstay and make the chain make more contact with the sprocket.heres a pic of the tensioner..... 4jeriif you look at the second pic enlarged you can see the spring feature. i wonder if i can flip it round or make one but the opposite.any help would be appreciated.adam Edited September 6, 2009 by arw_86 Quote Link to comment Share on other sites More sharing options...
pogo Posted September 6, 2009 Report Share Posted September 6, 2009 Solihull?I think flipping the spring the other way would help but i'm not sure, could't you just remove some links from the chain to prevent skipping. Quote Link to comment Share on other sites More sharing options...
arw_86 Posted September 6, 2009 Author Report Share Posted September 6, 2009 ye, hillfield, solihull near monkspath.ye wel im gonna get my chain as tight as poss, but still think its gonna take the chain away from the sprocket too early and ill lose a few vital teeth i could be grabbing on to.i can see tomo as being a nightmare day of me gettin pissed off tryin to figure something out. might just use it the way it should be used but just worried about the wear and tear and skipping problems. Quote Link to comment Share on other sites More sharing options...
pogo Posted September 6, 2009 Report Share Posted September 6, 2009 What gearing are you using? Quote Link to comment Share on other sites More sharing options...
ashleysmith Posted September 6, 2009 Report Share Posted September 6, 2009 turning the spring round wont do anything, they do do a reverse spring though, look on www.ison-distribution.com for it Quote Link to comment Share on other sites More sharing options...
MikeCottTrials Posted September 7, 2009 Report Share Posted September 7, 2009 Won't work i don't think. If it where as easy to do as just flipping the spring over a company would have developed one that worked in that way. As far as i know there isn't one available on the marketI can't seem to think why right now but i think theres a fundemental reason why tensioning up doesn't work Quote Link to comment Share on other sites More sharing options...
ashleysmith Posted September 7, 2009 Report Share Posted September 7, 2009 just had a bit of a "brain fart" you can put sont back tension on the spring, but by the time you've got the tension you need you'll have snappen the end off the spring..trust me, the amout of time i've done it at work. Quote Link to comment Share on other sites More sharing options...
pogo Posted September 7, 2009 Report Share Posted September 7, 2009 I can't seem to think why right now but i think theres a fundemental reason why tensioning up doesn't workRowan uses upward tensioning with a flipped 74kings Quote Link to comment Share on other sites More sharing options...
Elliot Posted September 7, 2009 Report Share Posted September 7, 2009 I have put a 4-jeri on once with up tension, I flipped the spring and then used whichever parts of the tensioner worked for the spring placement. Sorry I cant be more specific but I did it about a year ago. I do remember just using the underside of the arm of the tensioner as one end of the spring placement. I didn't use it like it because it made bugger all difference to my chain skipping. For me it turned out that I was trying to run too small a sprocket on the hub. Once you get to below 14t you really need a double jockey wheel to achieve decent wrap arond the sprocket. Quote Link to comment Share on other sites More sharing options...
arw_86 Posted September 7, 2009 Author Report Share Posted September 7, 2009 (edited) i got 14 tooth on the back. i dunno what to do now. dont really wanna fork out for a double wheel tensioner as is have a chunky chain that i dont think will fit through a double wheel anywaytryin to do it all on a budgetthanks for all help so far though Edited September 7, 2009 by arw_86 Quote Link to comment Share on other sites More sharing options...
Elliot Posted September 7, 2009 Report Share Posted September 7, 2009 i got 14 tooth on the back. i dunno what to do now. dont really wanna fork out for a double wheel tensioner as is have a chunky chain that i dont think will fit through a double wheel anywaytryin to do it all on a budgetthanks for all help so far thoughyou will be able to tell if chain wrap is the problem if you get an old mech whack it on and lock it to the right position. If the chain no longer jumps over the sprocket then you will need to buy a double wheel tensioner (or just keep using the mech) or use a larger sprocket. If you find the chain still slips then the problem is most likely going to the the chain. It will either be stretched or you have not taken enough links out of the chain. Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted September 7, 2009 Report Share Posted September 7, 2009 (edited) I would take the spring out all together. Then, get a big chunky elastic band and a Zip-tie, shorten the chain and wrap the elastic band round the arm of the 4-jeri to the chain stay then secure it with the Zip-tie. It's ghetto, but it works.Those things actually work fine tensioned down the way if you're chain is tight enough to begin with.Plus...This pushes the chain up or down. Expensive! Edited September 7, 2009 by Ross McArthur Quote Link to comment Share on other sites More sharing options...
Skoze Posted September 7, 2009 Report Share Posted September 7, 2009 It is possible, i did it with mine (and hacked a chunk out of it to clear the funky leeson mech hanger arangement) I just took it apart and fiddled 'til it worked upwards, sorry i cant be more specific! Ross' idea would work absolutely fine though, give that some thought Quote Link to comment Share on other sites More sharing options...
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