[Knuckleslammer]

Ok this is probably been asked 10k times before, but here it goes. I have a 03 Kona Stanky 9. It has 9 speeds. However when I am in the large gear in the back 34 I think and a single 32T gear up front and I pedal backwards the chain falls down to the next gear. now I have a truvativ ISIS hussafelt BB and an MRP system 1 mini me with 32 T. I can not move the chainline any more to the center of the bike as I have the boomerang on it so it's as far in as it can go. I'm assuming the chain falls off because of the wacky chainline which is all but straight or in line. When I am in the largest gear in back too, the derailleur is centered as well, but whenever I pedal backwards, off it goes. This makes hucking a nightmare as sometimes I inadvertantly pedal backwards prior to the drop and then when I pedal to launch the drop; KACHUNK the frign chain was partially on the second largest ring. This makes hucking a real pain in the ass. Can I possibly take off the smallest gear on the cogset and have it an 8 speed and move all the other gears one position away from the center of the bike, making the chainline better, and then just use the adjuster screw on the derailleur from letting the chain go over the last tallest gear into the spokes? Any advice is appreciated. The bike also came setup this way. Is there anything I can do? knuck

 

[ohio]

Not a whole lot, other than get a rohloff or lock out your largest cog and not use it.

You could get a Profile 6-spd rear hub, and drop all your smallest cogs. Or put a spacer behind your cogset and remove one of the smaller (non-fixed) cogs.

You could also try bending your boomerang inwards or using a different guide.

 

[Knuckleslammer]

Originally posted by ohio
Or put a spacer behind your cogset and remove one of the smaller (non-fixed) cogs.

Thats what I meant. What do you mean by non fixed. I have no experience with cogsets. So I can take off the smallest cog that I don't use anyhow and put a spacer behind the largest cog to compensate for that? Does it have to be a special spacer or can I use any old spacer? Do you think that would work? How could I make it then so I couldn't shift into where the spacer is? Thanks, knuck

 

[ohio]

Originally posted by Knuckleslammer
Thats what I meant. What do you mean by non fixed.

Depending on your cogset, your smallest 4 cogs are not attached to a "spider." You can't remove the smallest or your lockring won't work, but you might be able to remove the second smallest AND the spacer between it and cog 3 if there is one. You'll then need to put spacers of some kind behind the cogset, probably two plastic cog spacers your LBS should give you from their parts box.

You then need to adjust the low limit screw on the back of your rear derailleur to make sure you can't shift past the big cog.

You'll have a rough shift from cog 1 to cog 3, but other than that it should work.

 

[Knuckleslammer]

Well it turns out I don't need to mess with the cogs after all. The idiot that assembled the bike put a spacer between the boomerang and the BB shell pushing the chainline out 2mm from the center of the bike. A quick removal of the BB assembly and removal of the 2mm spacer solved the problem. Oh and the idiot that assembled the bike. That would be me
knuck

 

[Brian HCM#1]

Originally posted by Knuckleslammer
Well it turns out I don't need to mess with the cogs after all. The idiot that assembled the bike put a spacer between the boomerang and the BB shell pushing the chainline out 2mm from the center of the bike. A quick removal of the BB assembly and removal of the 2mm spacer solved the problem. Oh and the idiot that assembled the bike. That would be me
knuck

I hate when that happens