Etap 11s RD question

Discuss light weight issues concerning road bikes & parts.
rsantos450
Posts: 35
Joined: Sun Feb 01, 2015 9:59 pm

by rsantos450

Hello, i have a problem, without the chain, when i put the rd in the large cog, it hits the spokes, but the jokey wheel is align to the 32 cog, the dropout is ok.

TobinHatesYou
Posts: 4179
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

rsantos450 wrote:
Thu Sep 12, 2019 10:11 am
Hello, i have a problem, without the chain, when i put the rd in the large cog, it hits the spokes, but the jokey wheel is align to the 32 cog, the dropout is ok.

This is unfortunately normal.

by Weenie


alcatraz
Posts: 2208
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

The cage is stretched at least half way in this gear, so the jockey wheel then usually clears the cog.

Remember a chain needs to fit inbetween them too so there should be enough clearance. You can get more clearance by tightening the B-screw (to a point). If you're attemting to run a short cage derailleur with a 32t cassette you could experience poorer shifting in the small cogs and/or noise when going 2nd to 1st.

ancker
Posts: 146
Joined: Sat Dec 31, 2011 9:29 pm

by ancker

Had a buddy with the same issue. Dropped his chain, destroyed both rear wheel and RD.
SRAM just shrugged and offered to sell him a new RD, said "chain drops are unlikely".

As Tobin states, this is fairly common.

Note: I have eTap 11sp on three bikes. So I'm not negative SRAM.

TobinHatesYou
Posts: 4179
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

alcatraz wrote:
Thu Sep 12, 2019 2:30 pm
The cage is stretched at least half way in this gear, so the jockey wheel then usually clears the cog.

Remember a chain needs to fit inbetween them too so there should be enough clearance. You can get more clearance by tightening the B-screw (to a point). If you're attemting to run a short cage derailleur with a 32t cassette you could experience poorer shifting in the small cogs and/or noise when going 2nd to 1st.

He’s not talking about b-gaps or the pulley touching the cog. For some reason the bottom of the eTap RD cage bends inward toward the spokes when there is zero chain tension...so much that there is overlap/contact. Should your chain break when you are shifted into the first cog, you will probably destroy your derailleur and possible even take out some spokes.

ChiZ01
Posts: 311
Joined: Wed Jan 01, 2014 6:20 pm

by ChiZ01

spokes are cheap the replace, don't worry about it

TobinHatesYou
Posts: 4179
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

ChiZ01 wrote:
Thu Sep 12, 2019 11:18 pm
spokes are cheap the replace, don't worry about it

eTap derailleurs are not cheap to replace. Nor is it fun to have a ride ruined if you drop your chain and the cage slacks enough to fly into the spokes.

ChiZ01
Posts: 311
Joined: Wed Jan 01, 2014 6:20 pm

by ChiZ01

TobinHatesYou wrote:
Thu Sep 12, 2019 11:24 pm
ChiZ01 wrote:
Thu Sep 12, 2019 11:18 pm
spokes are cheap the replace, don't worry about it

eTap derailleurs are not cheap to replace. Nor is it fun to have a ride ruined if you drop your chain and the cage slacks enough to fly into the spokes.
what's the alternative? sell his groupset and lose money?

alcatraz
Posts: 2208
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

It's very hard to torque the first gear to the point of breaking the chain. Your speed would be very low too. I wouldn't ride around worrying about it, but I admit it's annoying that it has to do that.

If you weigh 100+ kg and try to sprint up a steep climb on a 25t cassette then that's a different story. Spinners need not worry.

ancker
Posts: 146
Joined: Sat Dec 31, 2011 9:29 pm

by ancker

Said buddy didn't break a chain when his incident happened. His chain dropped off the small ring. Bang.
Chain catcher would have helped, but really shouldn't be required these days.

Sure, maybe the FD was out a mm or two, but still, a design where its possible that the RD is perfectly set up and the cage still goes into the spokes is pretty bad.

NickJHP
Posts: 270
Joined: Wed Feb 14, 2018 2:22 am
Location: Canberra, Australia

by NickJHP

Don't cross-chain and you shouldn't have the problem, as you won't be changing between chainrings while on the largest rear cog. In 40-plus years and about three-quarters of a million kilometres of cycling, I can't recall ever having a chain drop except when I was changing at the front.

TobinHatesYou
Posts: 4179
Joined: Mon Jul 24, 2017 12:02 pm

by TobinHatesYou

I often stay in my big ring as long as possible, then shift down to the small ring while also shifting from the 2nd cog to the 4th cog. In fact this is SRAM's recommended shifting point with AXS as you can see here. I have also had one inner drop this season on a climb. Luckily I was not that far down the cassette that time, and also was able to get off the bike, fix the chain and get back to the leaders.

Yes, the cage makes contact with the spokes even in the 2nd position.
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rsantos450
Posts: 35
Joined: Sun Feb 01, 2015 9:59 pm

by rsantos450

I Will post a video.Image

Enviado do meu POCOPHONE F1 através do Tapatalk


rsantos450
Posts: 35
Joined: Sun Feb 01, 2015 9:59 pm

by rsantos450

https://youtu.be/kbJTQFazqcU

Enviado do meu POCOPHONE F1 através do Tapatalk


by Weenie


Jugi
Posts: 539
Joined: Sun Jun 24, 2018 8:10 am

by Jugi

Yes, we understood you from the first post. This is a well known feature (at least for anymore who has installed an eTap group).

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