ogre Posted June 14, 2010 Report Share Posted June 14, 2010 (edited) why does the tension in my chain change as i spin the cranks round? it's slacker when the cranks are in my riding postion (left foot forward) and tight in the opposite? have i bent something? or is this the norm? isis burns with a cloud 9 and a pro2 on the back. if that makes a difference? also are rock pads in cnc'd vee backings any good on a smooth rim? and will bealay pads fit in my TNN vee backings (i have the earlier backings with crm material) Edited June 14, 2010 by ogre Quote Link to comment Share on other sites More sharing options...
Mikee Posted June 14, 2010 Report Share Posted June 14, 2010 (edited) I got told that this is slightly down to uneven wear on the chainring as us trials riders tend to mostly ride with our good foot forward making one only side of the chain ring see alot of action. Also I have been told that parts are hardly ever perfectly centric wich will make it abit ovalised. Or like you said it's possibble something might be bent. Don't hold me to either of those theories though. I'm sure it's nothing to worry about as pretty much every trials bike I have ridden does it. Edited June 14, 2010 by Mikee Quote Link to comment Share on other sites More sharing options...
ogre Posted June 14, 2010 Author Report Share Posted June 14, 2010 if i rotated the sprocket round would it change? i don't think it's the BB cause i moved the cranks to different splines and it was the same maybe a new chainring up front is in order. Quote Link to comment Share on other sites More sharing options...
forteh Posted June 14, 2010 Report Share Posted June 14, 2010 if i rotated the sprocket round would it change? i don't think it's the BB cause i moved the cranks to different splines and it was the same maybe a new chainring up front is in order. Have a look for uneven wear on the top/front of your sprocket when your chocolate pedal is forwards, if the teeth are signigicantly worn just rotate the sprocket Quote Link to comment Share on other sites More sharing options...
MikeCottTrials Posted June 14, 2010 Report Share Posted June 14, 2010 if i rotated the sprocket round would it change? i don't think it's the BB cause i moved the cranks to different splines and it was the same maybe a new chainring up front is in order. If you did that it would just be slack at a different point. Don't worry about it, it's been a minor problem in all the time I've been riding but it's never interfered in a big way. Quote Link to comment Share on other sites More sharing options...
ogre Posted June 14, 2010 Author Report Share Posted June 14, 2010 if it's tight on my choco foot i'll have faster engagements. i don't mind if it's slack elsewhere... Quote Link to comment Share on other sites More sharing options...
dirt jumper jake Posted June 15, 2010 Report Share Posted June 15, 2010 Exactly the same thing happens on my bike dude, i dont think its really that much to worry about. Quote Link to comment Share on other sites More sharing options...
Duncy H Posted June 15, 2010 Report Share Posted June 15, 2010 This is quite a common thing. I think it is most likely to be your freehub, it is demonstrated here in this tarty guide with a freewheel but I am sure the same principles will apply for a freehub. Quote Link to comment Share on other sites More sharing options...
Dale-Hill Posted June 15, 2010 Report Share Posted June 15, 2010 My tensile FW and monty use to do this too, when i got my ENO it's not happened since Quote Link to comment Share on other sites More sharing options...
Leistonbmx Posted June 15, 2010 Report Share Posted June 15, 2010 It's just where the freehub/ffw or whatever isn't perfectly concentric Sp? Basically it's not all a perfect radius from one point so one point is higher from the axle(centre of the circle) than the other. Just put which ever foot you have forward, forward when setting chain tension. Doesn't really matter how tight it is with the opposite foot forward. Quote Link to comment Share on other sites More sharing options...
konstant Posted June 15, 2010 Report Share Posted June 15, 2010 This has happened to me from day one, and my new freewheel was fitted by Tarty to new cranks. Basically your freewheel is isn't perfectly round. Quote Link to comment Share on other sites More sharing options...
ogre Posted June 19, 2010 Author Report Share Posted June 19, 2010 i don't have a freewheel, i rock a pro2, i'll asume it's my cranks/bashring. thanks for the replies! Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted June 19, 2010 Report Share Posted June 19, 2010 I would go with that too. On the freewheel encentric thing The echo fw I had was as near to perfect as I have had. My eno wasn't bad either, tensiles a bit worse. Quote Link to comment Share on other sites More sharing options...
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