Derailleur Advice

[Shanks Kop]

Hi
I'm hoping you can help, first major problem for a while. i've tried to work it out myself

I have a Genesis Day 02 2007 bike
Link to the bike on the Evans site - http://www.evanscycles.com/products/genesis/day-02-2007-hybrid-bike-ec014604#features
SPECS
Gears: Shimano Tiagra 27 speed groupset
Shifters: Shimano SL-R400 shifters
Chainset: 50/39/30 tooth chainset
Brakes: Shimano BL-550 levers with Tektro 356 brakes
Problem - My rear derailleur has snapped Shimano Tiagra RD 4500. I have no idea if this is a short/medium cage
Part
I believe they have stopped manufacturing the Shimano Tiagra RD 4500.
Using Evans as a reference again. I think one of the below would be the replacement
Shimano Tiagra RD 4601 (best price £29.99 at Evans)
http://www.evanscycles.com/products/shimano/rd-4601-tiagra-10-speed-rear-derailleur-ec041359
or if I read the specs sheet correctly a slightly better then the Tiagra Shimano RD-5701 105 (best price £37.50 tweekscycles.com)
http://www.evanscycles.com/products/shimano/rd-5701-105-10-speed-rear-derailleur-ec041358
Both in a Medium Cage (GS) and Short cage (SS) variant. I'm a little lost as to the one i need cage wise
Questions

• Will both the models listed above work as a replacement for my obsolete version. I'm sure the answer is yes but always best to confirm
• Which one will I need Medium (GS) or short (SS) - I think i need the Medium GS model , but need confirmation before ordering. I've worked that out on the below formula with a little help from the net

Total Capacity = (Big Ring Front chainset minus Small Ring Front chainset) + (Big Cog rear minus Small Cog rear)
= (50T - 30T) + (27T - 11T)
= (20T) + (16T)
= 36T

• It it a part that i could possibly fit myself? I am a bike repair novice
• I'm also considering a service, would it be more beneficial to opt for a service and get the parts replaced as part of the service?

Thanks in advance guys

 

[Peteaud]

both will be GS Med cage.

They are not that hard to fit, you just need to tweek and set tit.

 

[Shanks Kop]

Hi Peteaud.

Thanks for the swift response.

GS medium it is , would you advise at this level the negligible difference in cost to go with the 105 rather then the Tiagra?

 

[Peteaud]

http://www.ribblecycles.co.uk/sp/ro...ver-5700-10-speed-rear-derailleur/shimgrrr520

In a word, yes, and as it is £37.40 from ribble.

spec :-
Shimano 105 Silver (5700) 10 Speed Rear Derailleur

- 10-speed 105 wide link rear derailleur
- Advanced Wide Link design increases rigidity and shifting performance
- Super stiff for fast and accurate changes across the cassette
- Large 11 tooth pulleys increase service life and reduce noise
- Super light shift action
- Compatible with 8, 9, and 10-speed drivetrains

Short cage - SS
- Maximum front difference 16T, total capacity 33T
- Weight 221g

Medium cage - GS
- Maximum front difference 22T, total capacity 39T
- Weight: 232g

 

[Peteaud]

or £38.00 from merlin, who i can 100% recommend.

http://www.merlincycles.com/bike-sh.../shimano-105-5701-rear-derailleur-silver.html

 

[Shanks Kop]

Thanks I've used both those in the past, but now you've got me started

Merlin seem to have some rather competitive prices for the next level up Ultegra's. Take it both these would be compatible too in a Medium GS

Ultegra 6500 ( presume an older model) - £35.99
http://www.merlincycles.com/bike-sh.../shimano-ultegra-6500-gs-rear-derailleur.html

Ultegra 6600 - £39.95
http://www.merlincycles.com/bike-sh...ad/shimano-ultegra-6600-rear-mech-silver.html

 

[Peteaud]

I would think so, just have a look on shimano tech site for the spec.

 

[Rickshaw Phil]

Quick question: Is it the derailleur that is broken or has the hanger snapped? On aluminium alloy frames the hanger is designed to break easily if impacted to save the frame and the derailleur from damage.

If it's the hanger it can be replaced seperately (link) but you'll need to know which type it is.

 

[Shanks Kop]

Quick question: Is it the derailleur that is broken or has the hanger snapped? On aluminium alloy frames the hanger is designed to break easily if impacted to save the frame and the derailleur from damage.

If it's the hanger it can be replaced seperately (link) but you'll need to know which type it is.

Just double checked hanger is still intact and attached to the frame.

The part of the derailleur attached to the hanger is exactly where it has snapped

 

[Kins]

http://www.tweekscycles.com/compone.../shimano-tiagra-10-speed-rear-derailleur-4601

£32.24​

​

http://www.evanscycles.com/products/shimano/rd-4601-tiagra-10-speed-rear-derailleur-ec041359

£29.99​

​

If you don't mind waiting for it Rose Bikes are cheaper still. You after the SS or GS?

 

[Rickshaw Phil]

Just double checked hanger is still intact and attached to the frame.

The part of the derailleur attached to the hanger is exactly where it has snapped

Fair enough. That's quite an unusual failure.

 

[Shanks Kop]

Thanks guys.

I've gone for the Ultegra at Merlin which was not too much more expensive compared to the others

http://www.merlincycles.com/bike-sh...ad/shimano-ultegra-6600-rear-mech-silver.html

 

[Kins]

nice!