SS Conversion Chain Length
cat_with_no_tail
Posts: 12,981
Converted the Karma to SS last week. For some reason though, I don't seem to be able to get the chain length right.
Running a 16t rear, 32t front, and have a fixed length 16.5" chainstay.
Should be 47 links, but that dosent seem to work.
I'm wondering if I should be calculating this differently due to dropping the rear mech in favour of a Jockey wheel type SS tensioner?
It all seems fine, rinning nice and smooth, until I get on the bike and put weight through the pedals, then it seems to cause the chain to slip.
not sure if I'm going too short or too long. Ideas?
Running a 16t rear, 32t front, and have a fixed length 16.5" chainstay.
Should be 47 links, but that dosent seem to work.
I'm wondering if I should be calculating this differently due to dropping the rear mech in favour of a Jockey wheel type SS tensioner?
It all seems fine, rinning nice and smooth, until I get on the bike and put weight through the pedals, then it seems to cause the chain to slip.
not sure if I'm going too short or too long. Ideas?
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Comments
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Take a link out and add a half link.
What formula are you using?"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
TSPCL = 0.25 * (F + R) + 2 * SquareRoot( [CSL * CSL] + {0.0796 * [F - R]} ^2 )
Where:
TSPCL = Theoretical Shortest Possible Chain Length
CSL = Chainstay length in inches
F = Front gear cog teeth
R = Front gear cog teeth
Done on a chain length calculator. It could be wrong I guess, but It's never let me down before.0 -
Pics of your set up at the rear."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
That's after I shortened that chain this morning to deal with the skipping (it didn't work).
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Use the tensioner to push up not down."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Eh?
Is it not supposed to be a push-down tensioner, like a rear mech?
Like this one
It's spring loaded like a mech would be, and fits in the same way, so when you remove the chain, it does this...
I don't see how I could make it a push-up.0 -
Most can be run either way. Running it pushing up stops the chain jump you have as the Cain is just too long.
Or look at a 17 or 33 tooth cog/ring instead. ( to increase the chain length by one tooth)."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Update. Checked again and still can't see how I'd change it from a push to a pull tensioner.
Hopefully these pics are a bit clearer as I've now got the new SS chain fitted.
1st pic shows what happens when chain is put under strain (normal riding, slight uphill)
Other pics to show chainline.
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To me it looks like way way to much chain."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0
