Chain length and powerlink Q

Harryburgundy · Jul 3, 2009

Hi
Couple of Q's which I think I know the answer to.
1. Is it OK to use a sram powerlink on a shimano chain (same size of course). I think...YES
2. Chain shortening. I have single 32T up front and 12/23 Ultegra on the rear running Dura-Ace 9 speed mech. Big cog to ring + two links as usual?
3. Looking at my set-up as is...the natural chain-line looks to fall on the third cog up on the cassette...leaving quite a stretch to the biggest
cog. Is this going to be OK? Havn't much room to play with BB axle length.
Cheers
Carl

Splatter Paint · Jul 3, 2009

1. Yes.
2. Dunno, if it the rear derailleur is in the 5 o'clock position in the biggest cog on the cassette, that is generally about right.
3. Hmm, my chainline is straight on the fifth smallest. I think it could be quite a stretch to the largest on your set-up as you say....

Harryburgundy · Jul 3, 2009

Thanks SP....I might have to re-think this little project.
I don't like the chain-line I'm getting. :?

Splatter Paint · Jul 3, 2009

How about using a few washers and spacing the front chainring over a few mm? That might be all you need to get a decent chain line.

SP

Harryburgundy · Jul 3, 2009

Middleburn Uno....no spider

perry · Jul 3, 2009

ive just got an uno and noticed its a few mm nearer the centreline of the frame compared to a spider and ring in the middle position

could you use a longer bottom bracket . could just be the next size up you need

Harryburgundy · Jul 4, 2009

perry":38k2jq38 said:
ive just got an uno and noticed its a few mm nearer the centreline of the frame compared to a spider and ring in the middle position

could you use a longer bottom bracket . could just be the next size up you need

Mmmm.....I think I need it the other way....the chainring needs to be closer to the frame in order have a 'natural' chainline approx. mid-way through the cassette....maybe this isn't necessary?

I'll measure the current BB, mock-up a chainline and take some pictures......I'm probably fussing over nothing

Thanks chaps

perry · Jul 4, 2009

yep , i miss read . i saw 3rd and thought the 3rd gear down

so maybe a shorter bb . my middleburns run with rizla clearance to the bb if that helps

Harryburgundy · Jul 5, 2009

Here we go...mocked up the bike.

Bottom bracket clearance..68x114 BB fitted.

'Natural' chain-line

Chain on biggest cog...looks painful.

Chain Length

Chain measured largest cog to chainring + 2...looks too short doesn't it?

On bottom cog

Top Cog

Longer chain fitted

Whatcha reckon fellas?

Cheers
Carl

Splatter Paint · Jul 5, 2009

Is that front chainring dished? If so can you take it off the cranks and re-fit it the other way around? This would improve the chain line.

Chain length and powerlink Q

Harryburgundy

Splatter Paint

Harryburgundy

Splatter Paint

Harryburgundy

perry

Harryburgundy

perry

Harryburgundy

Splatter Paint

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