Derailleur hanger extenders for 42t cassette - anyone used one?

dirkpitt74

So, need a goat link (only works with Shimano??) or similar to allow me to use the SRAM X7 mech with a 42t cassette on my lads NS Clash Build.

Tried using an extended b-screw but still not enough clearance.

Have seen THESE on eBay and thought I'd give it a go for £3.00

Has anyone used an extender successfully?

Thanks

drlodge

I've used an Alpe D'Huez Road Fairy on my road bike, allows me to go from 29T to 32T cassette, just. Looks very similar, they have their limitations though. For £3 give it a try.

dirkpitt74

Thanks - will give it a go and see.
Frustratingly I recon I could get away with a 40t as it only just fouls the 42t.

mattyfez

I have an x7 an an 11-34 XT 9 speed cassette which works fine.

Not sure if x7's have a long cage variant, but 42 sounds a big jump, do you really need a 42?
I suppose you would with a single speed crank set?

What's the full gear system being run? Front rings etc, it might help people advise, but if you want to run big rings on the back wheel, an x7 is probably not ideal as it's an older 9 speed derailleur.

dirkpitt74

It's a 10 speed rear mech, looks like a long cage.
Running it with a 30t single ring up front.

These are the best photos I have:

02gf74

Yes, although my cassette is 40-11,no response why 42 would not work..

See here, has photos.

viewtopic.php?f=10004&t=13091713&p=20337458&hilit=Extender#p20337458

steve_sordy

I just looked at your pics 02GF74.

Wow, that mech arm is well stretched out! I have never seen one so stretched that it is horizontal. How are you getting on with that? Am I right to assume that the bike rear suspension is a linkage driven single pivot?

JGTR

steve_sordy wrote:

I just looked at your pics 02GF74.

Wow, that mech arm is well stretched out! I have never seen one so stretched that it is horizontal. How are you getting on with that? Am I right to assume that the bike rear suspension is a linkage driven single pivot?

Chain is far too short.

02gf74

Hmm, i did check chain length biggest sprocket - chainring plus 2 links and that is the result. It had 42t chain ring and 32 t biggest sprocket before without any problems but I probably never had ridden that combination.

Will check again as it does look a bit suspect especially with a bouncy rear end.

JGTR

Never got on with the big/big + 2 method. My local shop said put it on the smallest rear cog and just make sure the derailleur is all the way back without the chain fouling the cage. Works for me....makes sense as it will give you the max amount of chain.

steve_sordy

I go big to big, with the mech arm pointing forward at 45 deg.

For a full suss that isn't a single pivot, fully compress the rear of the bike to check that the axle to axle growth doesn't overwhelm the chain and rip your mech off! If you can't compress the shock, then let the air out. I know it's a pain but you know it makes sense!

The Rookie

JGTR wrote:

Never got on with the big/big + 2 method. My local shop said put it on the smallest rear cog and just make sure the derailleur is all the way back without the chain fouling the cage. Works for me....makes sense as it will give you the max amount of chain.

Why would you want the maximum amount of chain clattering around over rough surfaces, drops etc?

Big big +2 for me (at max chain length on an FS).

JGTR

The Rookie wrote:

JGTR wrote:

Never got on with the big/big + 2 method. My local shop said put it on the smallest rear cog and just make sure the derailleur is all the way back without the chain fouling the cage. Works for me....makes sense as it will give you the max amount of chain.

Why would you want the maximum amount of chain clattering around over rough surfaces, drops etc?

Big big +2 for me (at max chain length on an FS).

Ha ha I knew you’d be along with this exact comment

Because if you do it your way and it’s too short then yiu’ll Need to buy a new chain.

dirkpitt74

Right then - swapped the cassette on my lads bike to the Deore 11-42t and fitted the £3.00 Chinese 'groat-rink'.

After a bit of fine tuning it on bl***y works!!

Only issue I have is not being able to pedal backwards on the 42t, but can't see that being too much of a problem.

So in conclusion you can't go wrong for the price.

dirkpitt74

02gf74

What's the problem pedalling backwards on the 42, chain comes off.

Re my bike, chain is right on the limit, big Big rings and suspension fully let down so may try adding too more links. Not having a clutch mech, the chain slaps about on the upper run when in the smaller sprockets.


We're there any 9 speed clutch mechs made (I'm not aware of any ), or is a 10 speed sram mech a direct replacement for 9 speed mech, again I suspect not.

02gf74

DirkPitt74 wrote:

So, need a goat link (only works with Shimano??) or similar to allow me to use the SRAM X7 mech with a 42t cassette on my lads NS Clash Build.

Tried using an extended b-screw but still not enough clearance.

Have seen THESE on eBay and thought I'd give it a go for £3.00

Has anyone used an extender successfully?

Thanks

898kor

02GF74 wrote:

What's the problem pedalling backwards on the 42, chain comes off.

Re my bike, chain is right on the limit, big Big rings and suspension fully let down so may try adding too more links. Not having a clutch mech, the chain slaps about on the upper run when in the smaller sprockets.


We're there any 9 speed clutch mechs made (I'm not aware of any ), or is a 10 speed sram mech a direct replacement for 9 speed mech, again I suspect not.

In my experience with Shimano the rear mech does not dictate the speeds - its the shifters.

My kids run 11sp Shimano SLX rear mech with Shimano 10sp Zee Shifters on Sunrace 10 sp 11 to 46 cassettes (no extended hangers needed with the Shimano SLX mech - the reason we bought them). Both of these just have the High and Low limit screws set to restrict the travel.

I run the same 11sp Shimano SLX mech but with an 11sp Shimoano SLX Shifter on a 11sp 11 to 50 cassettes (again no extended hanger required).

I would imagine SRAM are the same, the mechs are just linear A to B movement, the shifter does the "positioning" so I would imgaine that as long as you buy a Mech with a greater range than you actually have then it would fit.

Just to add to the core topic, I have also had success with the extended hangers, getting a Shimano DEORE that was specced as 42t max to work with 50t - its just I do not like the extra leverage they place on the hangers, I also found that when you were pushing hard and not making the most mechanically forgiving gear changes that the chain jumped more easily, I suspect that was the extra length of the hanger allowing greater twisting. Chainreaction were selling the SLX 11sp mech for £32 in red hot drops sale - one of the best mods I have done, silky smooth gearchanges with big ratio movement.

02gf74

898kor wrote:

In my experience with Shimano the rear mech does not dictate the speeds - its the shifters.

.

I.m pretty sure that's incorrect, certainly for shimano and some sram.

Shifter pulls a fixed amount of cable for each gear and mech is designed to to move a certain amount depending on the amount of cable.

The Rookie

Both SRAM and Shimano have changed their pull ratio, Shimano did it for 10-11 speed road and 9-10 speed MTB (so I can run my 9 speed MTB mech 10 speed using a road shifter) SRAM changed from 2:1 or exact actuation as well.

898kor

02GF74 wrote:

898kor wrote:

In my experience with Shimano the rear mech does not dictate the speeds - its the shifters.

.

I.m pretty sure that's incorrect, certainly for shimano and some sram.

Shifter pulls a fixed amount of cable for each gear and mech is designed to to move a certain amount depending on the amount of cable.

Its not incorrect - I have it running on three bikes so its not just a fluke - as mentioned above, I have 11sp mechs running 10sp cassette and 10sp shifters with no problems. You just have to make sure you are using the same pull ratios on the shifter and rear mech.

Be it Shimano or SRAM - the rear mech does not control how far itself moves (as it only has a set range from its high to low positions that are not stepped) the shifter is the part that dictates the movement distance as each click moves the cable a predetermined distance and the rear mech reacts accordingly - in relation to the pull ratio. So as long as the ratios are the same it works.

drlodge

Yes it is all about pull ratios. This means you can mix Campag shifters with Shimano rear derailleurs aka Shimergo. I have an old 126mm OLN Condor frame with 7 speed cassette, its practically the same sprocket spacing as the 8 speed cassette used on 130mm OLN rear hub and works just great with 10 speed Campag shifters.

https://jefaisduvelo.wordpress.com/2013 ... ift-ergos/