Cassette/ R-Derailleur change technical question
 

Hi all, I'm new here and haven't went through the threads so I'm sure I'll ask the same questions others have asked. Also I am new at customizing bikes, i have probably have missed some tech stuff.

But here's the delima: I would like to change my rear cassette from a 12-30T to a 11-36T. I live in the Rockies and deal with some very long up-hill climbs. I realize that i need to change my rear derailleur as well.
The cassette I'm thinking of is a Shimano CS-H681 SLX Cassette 10-Speed 11/36T,
and the R-Derailleur a Shimano RD-M593 Deore RD SGS Long Cage 10-Speed.

So the big question is will these new components work with with my current rear shifter, and forward drive train? If not what else will i need?

My current shifter is a Shimano 10-speed Tiagra Rapid fire flat bar shifter. (model number unknown, couldn't find one)
Crankset/ front derailleur - FSA VERO Compact N10 50/34T with shimano 105 front derailleur.
Chain - FSA CN-910 10 speed chain (114 links road/mountain chain).
If your wondering what the bike is, its a Diamondback Interval Elite 2013.

Thanks for your help,

Steven

So the big question is will these new components work with with my current rear shifter, and forward drive train? If not what else will I need?


I think the rear shifter should work. You may need a few more links in the chain to accommodate the 36 tooth cog.

[QUOTE=I think the rear shifter should work. You may need a few more links in the chain to accommodate the 36 tooth cog.[/QUOTE]

1+

I personally would also put a new chain on. Rear cassettes and chains tend to wear together and when only one is replaced makes for ghost shifting. Unless they have low miles.

Asking this question in the mechanics' sub-forum may get a more informed response.

I call shinanigans on this. I'd say more like two chains to one cassette.

Assuming your chain is properly sized @ 114 links, you will need 3 half links. Since you can only lengthen in link SETS (inner +outer = 1"), you'll need to (probably) lengthen the chain by 2 inches. You "might" get by on one link set, depending....

What I would do to measure-
Put chain on largest ring & cog-
Take 2 skinny screw drivers and insert through the links about 3" apart.
Move the screw drivers together and see how much chain slack you can generate.

Typical slack should be at least 1 link SET, but < 2 link SETS.
IF you are close to 2 link SETS, you should be able to get by with 1" extra.

Personally, I'd just get a new chain to avoid having to use the relatively expensive joining pins etc.
You could put it away in a plastic bag with your old cassette and use the pair together in case you want to retrofit.