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Converting 8-speed double to 9-speed triple(9 posts)

Converting 8-speed double to 9-speed triplewilly2351
Dec 11, 2003 4:55 PM
I have an older Litespeed with an 8-speed double drivetrain. I want to convert it to a 9-speed triple. I figure that I need the following parts: shifters, crankset, bottom bracket, front and rear deraileurs, cassette and chain. Am I missing anything? Hubs, maybe?

Thanks very much for your help!
re: Converting 8-speed double to 9-speed tripleRusty Coggs
Dec 11, 2003 7:29 PM
That's it if it's shimano. the RD is optional assuming your 8 speed stuff is not DA. The short cage RD will work with a triple,but depending on the cogset,there will be some small cogs that may not be usable in the granny due to insufficient chain wrap capacity.Not really an issue if you consider the granny a bailout.
re: Converting 8-speed double to 9-speed tripleChen2
Dec 12, 2003 12:10 PM
You don't need to change the cassette or chain unless you need a change in gear ratios or if they are worn out.
If your 8-speed is D-A you'll also need to change the shifters and both derailleurs, I think.

You really need to give more specifics about what you've got, Shimano, Campagnolo, which group or mixed group.
re: Converting 8-speed double to 9-speed triplewilly2351
Dec 12, 2003 3:19 PM
Thanks for your help. What's on the bike now is Dura-Ace 8-speed double crankset, probably from about 1995. Unless someone helps me see that it is a mistake, I intend to convert to a Ultegra 9-speed triple. I believe that the chain and cassette need to be replaced in any event. i.e., they are worn out. This is actually my wife's bike. The bottom line is that she wants a triple.

Thanks much!
re: Converting 8-speed double to 9-speed tripleRusty Coggs
Dec 12, 2003 5:08 PM
I told it right to begin with.... But here is a wrinkle,since you have 8 speed DA. You can leave it 8 speed in the rear and keep the 8 speed DA RD, assuming it's in good condition. You still need crankset,BB and triple FD. The wrinkle is that 9 speed shimano shifters combined with a 8 speed shimano DA( and DA only) RD WILL shift a Shimano 8 speed cogset perfectly. You will however still have the limited wrap capacity issue of the short cage DA rear derailer. But since you are replacing the chain and cassette anyway,may as well make it all 9 speed.
re: Converting 8-speed double to 9-speed tripleRusty Coggs
Dec 12, 2003 4:58 PM
You sure you read that right. How does 8 speed casesette work with 9 speed shifters?
re: Converting 8-speed double to 9-speed triplewilly2351
Dec 13, 2003 5:45 AM
Thanks very much!
Explanation...satanas
Dec 14, 2003 9:22 AM
All Dura-Ace up to 1996 (pre-9 speed) used the same ratio of cable movement to derailleur travel. BUT when Shimano made the 600 group with indexing (their second indexed group after DA 6 speed in 1984) they decided to change this so that more cable movement was required, perhaps to force people to buy expen$ive Dura-Ace spares.

When DA 9 speed came along, Shimano decided to make the cable travel the same for DA as for everything else, ie more cable movement was required for the same lateral movement at the derailleur. This means that 9 speed shifters will work with pre-97 DA as 8 speed, and 7/8 speed non-DA shifters will work with pre-97 DA as 6 speed, etc.

This also means that DA 8 speeed shifters will shift 8 cogs with 9 speed spacing on a 7 speed hub when used with a post-97 DA or non-DA rear derailleur.

Confused? It's all quite simple really!
re: Converting 8-speed double to 9-speed tripleAl1943
Dec 14, 2003 4:53 PM
Yeah Rusty, I blew it on my previous post.
Al, (Chen)