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Old 08-23-10, 10:07 AM   #1
MrMJS
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time to upgrade derailleurs

im runnin a 07 sirrus. the bike came with these....

FRONT DERAILLEUR - Shimano T301, 31.8 clamp, bottom pull
REAR DERAILLEUR - Shimano Sora, long cage

I rode my brothers Cannondale, his came with Tiagra derailleurs, I could tell a difference as soon as I shifted.... which of these do I want to get???

ALSO, my bike is an 8 speed.. was looking at these for the front - tiagra front - 105 front or ultegra front

AND these for the back... tiagra - 105 - ultegra .... Do I need short or long cage?

my current cassette is a shimano hg50 8 speed.

Will my current shifters work wit these?? Shimano EF-50, EZ Fire
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Old 08-23-10, 10:42 AM   #2
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My 2007 Sirrus LTD came with Ultegra derailleurs standard. The front is a bottom-pull Ultegra, and the back is a short-cage Ultegra. 10 speed cassette. You are going to love the smoothness of the Ultegra components!

My baby:



I also have a commuter bike that has EF50 shifters and Alivio rear derailleur and 8-speed cassette, and the Alivio rear derailleur was destroyed in a crash. My local bike shop replaced it with a long-cage Ultegra rear derailleur and it's been working perfectly. So I'm pretty sure an Ultegra rear derailleur should work with your 8-speed cassette and EF50 shifters.
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Old 08-23-10, 10:44 AM   #3
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You may just need a bike shop tune up.. by a skilled mechanic.

105 is certainly a higher price point component group.
Ultegra one level higher cost.. than 105, Tiagra 1 niche lower

the group your bike was fitted with, was part of the selling price-point of the bike .
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Old 08-23-10, 01:35 PM   #4
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I stopped by my LBS today. They told me I should upgrade my shifters as well... my cassette is an 8 speed too, so 105 might not work. Any recommendations on shifters?
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Old 08-23-10, 02:20 PM   #5
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have to get old parts ,, for new, Shimano is so past 8 speed theyre going to 10 now that Campag has gone to 11.

they sell the 8 speed, from lowest cost subcontract manufacturers, to equip low pricepoint bikes , these days
X Mart and so forth. ship old tooling for the past production out to the Sub's and retool for the next generation of Gizmo.

If you drop Indexing and use friction shifters then the adaptation is in your hand.

you may have to replace the whole drivetrain to 9 speed , then a new bike may be a better deal ..

Other than that, eBay and wanted ads on this site may be a way to go ..
Yard sales and Charity shops .. look for donor used bikes with some of the parts you want.

Last edited by fietsbob; 08-23-10 at 02:29 PM.
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Old 08-23-10, 03:06 PM   #6
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so we're talking about cassette, chain, front and rear derailleurs, shifters and probably brake levers too... which would also mean a new wheel if current wont take a 9/10 speed cassette.. what about chainrings & crank set too??? :/
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Old 08-23-10, 04:05 PM   #7
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Here's my commuter bike that I was talking about:



It's a GT Zaskar Urban Machine commuter bike, and it came stock with an EF50 8-speed Shimano rapid-fire shifter, and Shimano Alivio rear derailleur and an 8-speed cassette. My Alivio derailleur was destroyed in a bike crash, completely bent out of shape, so it had to be replaced.

My local bike shop replaced the Alivio derailleur with an Ultegra long-cage and a narrower chain (to fit through the Ultegra derailleur), but kept the 8-speed cassette and EF50 rapid fire shifter.



The EF50 shifters



The Ultegra long-cage rear derailleur



The 8-speed cassette that is still on the bike, works just fine with the Ultegra derailleur.

The derailleur itself is not indexed. The indexing is in your EF50 shifter, and it has the right amount of pull for that 8-speed cassette. So a 105 or Ultegra rear derailleur should work just fine with an 8-speed cassette as long as you have the right width chain to fit through the derailleur.

If the spacing of the dropouts on your frame is not enough for a 10-speed setup, then you will have to stick with the 8-speed, in which case just replacing the rear derailleur and chain should do it.
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Old 08-23-10, 04:29 PM   #8
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maybe all you need is a good drivetrain tune-up. New bikes vs. old make a difference too. Short vs. long cage have different shifting feel.

To put it into perspective, my commuter mtb has a low cost Shimano Tourney rd that shifts crisply and sharply. It is about as good as my Dura Ace RD in my road bike. For FD, the TX-whatever on the mtb is not as smooth but gets the job done vs. my Ultegra double. It is important to make sure the good placement of the derailleur cage. Limit screws must be spot on.
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