|   Chain drop | DSR
Feb 1, 2003 3:12 PM | | I thought I had successfully converted my HT without having to need a tensioner. But on a recent ride whenever I hit a steep climb there would bea sharp crack sound at my chain and it would drop. No big bumps, just more tension on the chain from the climb. The other piece of info is that I am currently running a Shimani IG ramped cog. And it's dropping off the side of the ramp. Is that the likely culprit? I'm ordering a CK BMX 19T cog thinking that should fix it. Any other possibilities or thoughts though? Thanks. S |
| Yup | shiggy
Feb 1, 2003 3:49 PM | | Most likely the ramped cog. The chainline could be off, too. You may be getting a small amount of flex in the frame/cranks/chainring on the climb and it is just enough to derail the chain at the ramp. |
| re: Chain drop | Tim T
Feb 2, 2003 5:52 AM | | Recheck you chain line a easy way to do this is to turn the bike upside down and spin the cranks look carefully at the cog and ring and notice where the chain rides. It should ride in the middle of the teeth not to the sides. Email me at the shop if you need more help advice is free.
Tim T
www.PHKbicycles.com
ps we do alot of these convertions |
| An even easier method... | loony
Feb 2, 2003 10:02 AM | | I picked up on this site last year (I don't remember who though). Allow the bike to remain upright and drop the chain off from the cog and the chainring. Get a straight edge long enough to span between the ring and cog, I usually use a carbon arrow. Line it up flat against the chainring, on the outside of the chainring making sure it is flat against it! Extend it backerds until it meets with where the cog should be. If it is off, measure the distance with a depth guage (or whatever you happen to have) and adjust the spacers accordingly. VOILA`! Check and recheck until it is right on line. I had the same problems until I tried this method. I thought that I had it eye-balled quite good, when in fact, I was off by about 1/8". And with chain stay flex, this could easily doubled. |
| CK Kog should fix it | GlowBoy
Feb 2, 2003 10:55 PM | | My first few experiments SSing with ramped cogs last year resulted in no end of dropped chains. Chainline wasn't the issue, because it would fall off one side or the other, depending. With BMX cogs, no dropped chains, ever. Do make sure your chainline's good though.
- Dan |
| Thanks all! | DSR
Feb 3, 2003 7:47 AM | | Hoping the CK will do the trick. Especially at $18! My road to SS simplicity has been paved with complexity! S |
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