Krisboats Posted August 26, 2007 Report Share Posted August 26, 2007 Okay, i bought a new chain yesterday as i kept snapping the kmc-alike one i had, choice in the shop was a KHE collapse or the same chain i had before. I ended up going for the collapse and fitted it and all was good.Thing is though i swear my gearings gotten harder now A couple of times yesterday i went to gap and the thing felt like it'd need some kind of hydraulic ram to shift the crank like i normally do.Is this normal changing from one brand of chain to another and one creating a stiffer gear ratio or is it something subconscious like i don't trust it yet and aren't stamping down on it.Gear ratio is 16:13 on a t-rex and i've been using it with kmc's for the past 7 months or so. Quote Link to comment Share on other sites More sharing options...
Ben Jones Posted August 26, 2007 Report Share Posted August 26, 2007 Maybe you need to let the chain wear into the sprocket. as with most new chains they need to be stretched. Quote Link to comment Share on other sites More sharing options...
sUm Posted August 26, 2007 Report Share Posted August 26, 2007 How much have you tensioned the chain? If it's really tight it will be difficult to move the cranks simply because the chain just doesn't want to move. Quote Link to comment Share on other sites More sharing options...
Krisboats Posted August 27, 2007 Author Report Share Posted August 27, 2007 (edited) How much have you tensioned the chain? If it's really tight it will be difficult to move the cranks simply because the chain just doesn't want to move.Not a great deal. It'll happily spin 2 or 3 rotations of the cranks when i try and double crankflip.Maybe you need to let the chain wear into the sprocket. as with most new chains they need to be stretched.Well whenever i've fitted a new kmc its never altered the feel of the gear ratio. The only things thats changed this time is its a brand new model of chain altogether. Edited August 27, 2007 by Krisboats Quote Link to comment Share on other sites More sharing options...
Krisboats Posted August 27, 2007 Author Report Share Posted August 27, 2007 Boats..Mate..Your just crap at gapping.**Check yoru tensioner thing, the new links will be 'stiffer' (not worn in yet) so you'll need to adjust it abit to begin with. Have a look...you never know..Yeah i set the tensioner up properly when i put the new chain on.Its not like its crap at gapping, its like a couple of times i went to put the power down on the cranks and i jumped without the wheel spinning.... as though someone come along and stuck a 12tooth cog on while i wasn't looking.Its just damn weird. I new i shouldn't have bought a KHE. Quote Link to comment Share on other sites More sharing options...
Tom Perkins Posted August 27, 2007 Report Share Posted August 27, 2007 Its just damn weird. I new i shouldn't have bought a KHE.buy another kmc? Quote Link to comment Share on other sites More sharing options...
matt rushton Posted August 27, 2007 Report Share Posted August 27, 2007 The chain doesn't have any stiff links yet does it. Because the KHE chains are known for that. What KMC did you used to use was it a BMX or MTB??Matt Rushton Quote Link to comment Share on other sites More sharing options...
Krisboats Posted August 27, 2007 Author Report Share Posted August 27, 2007 KHE is brand new out the box, no stiff links. Used to use a kmc kool k710. Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted August 27, 2007 Report Share Posted August 27, 2007 you were using the thin KMC right?so the KHE would be heavier and will be rubbing on your middleburn cog bedding itself in. don't worry about it matey. it will wear in soon enough Quote Link to comment Share on other sites More sharing options...
Krisboats Posted August 28, 2007 Author Report Share Posted August 28, 2007 you were using the thin KMC right?so the KHE would be heavier and will be rubbing on your middleburn cog bedding itself in. don't worry about it matey. it will wear in soon enoughNah man, it was a normal bmx kmc. Quote Link to comment Share on other sites More sharing options...
dave85 Posted August 28, 2007 Report Share Posted August 28, 2007 Wear in the rollers of the chain can change the effective diameter over the sprocket. Obviously its not much, almost f**k all infact but noticeable if you're in tune with your bike. Quote Link to comment Share on other sites More sharing options...
BONGO Posted August 28, 2007 Report Share Posted August 28, 2007 A chain, quite obviously CANNOT change the gear ratio. So something else is producing extra resistance. It could be that the chain was tretched due to age/use, and the new chain, when fitted is actually tighter. Move your wheel in to get the same tension as before, if you haven't already. (If needed)The best chain to use, in my experience (of never having managed to snap one) is a KMC 510HX chain available from HERE (alansbmx) The KOOL chains by KMC have a lower strength rating than these, are heavier than these, and also have larger protrusions along the edges of the outer plates, which lever the outer plates off the pins easier and cause the plates to bend. This has been noticed in bmx on grinds etc. But for trials, with all the chain on wall action, i'm sure it's an eqally consistent occurence.Maybe you just haven't had your weetabix lately...bongo Quote Link to comment Share on other sites More sharing options...
JonMack Posted August 28, 2007 Report Share Posted August 28, 2007 The best chain to use, in my experience (of never having managed to snap one) is a KMC 510HX chain available from HERE (alansbmx) The KOOL chains by KMC have a lower strength rating than these, are heavier than these, and also have larger protrusions along the edges of the outer plates, which lever the outer plates off the pins easier and cause the plates to bend. This has been noticed in bmx on grinds etc. But for trials, with all the chain on wall action, i'm sure it's an eqally consistent occurence.bongoHere's the chain Bongo talks about.http://www.alansbmx.com/product_info.php?products_id=1296 Quote Link to comment Share on other sites More sharing options...
Krisboats Posted August 28, 2007 Author Report Share Posted August 28, 2007 K710 Kool Chain For the "Kool" guys KMC makes this chain with an impressive tensile strength of 1,300 Kg. Z510HX & Z610HX This is a perfect chain for racing and Heavy Duty BMX use, the tensile strength is a good 1,200 Kg.Am i right in thinking the tensile strength is the strength we test the most when peddle kicking? Quote Link to comment Share on other sites More sharing options...
Fixed Pants™ Posted August 28, 2007 Report Share Posted August 28, 2007 I don't know about the gapping problem, but, yes, you're right, tensile strength is how far it can be stretched before snapping. (basically anyway)DT ***. Quote Link to comment Share on other sites More sharing options...
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