50-28 gear combo, it's a long cage rear derailleur and the b screw is almost fully winded out (imo the gap is still a bit too big).
by Silver_Age_676
50-28 gear combo, it's a long cage rear derailleur and the b screw is almost fully winded out (imo the gap is still a bit too big).
by Silver_Age_676
12 Comments
Did you compare the new chain with the old chain before you installed it ?
> 50-28 gear combo, it’s a long cage rear derailleur and the b screw is almost fully winded out (imo the gap is still a bit too big).
This is to be expected. The RD-M3100-SGS isn’t intended for cassettes smaller than 32T.
> Is my bike chain a bit too short?
It looks OK, what we can see, but I’d like to see it in small:small.
Can you push the cage up when in big:big, or is it taunt?
EDIT: mistyped the RD model number.
I certainly wouldn’t want it any shorter, but if everything is shifting fine and you have enough gap between your upper pulley and big cog (which seems to be the case from your photos), then you’re fine. You can always check Shimano’s documentation if you want to be extra certain.
Personally I’d add some links.
Yes, this is short. Too short for me. But if it works, it works. Your derailleur must just be free on the smallest cog.
Not necessarily too short. You won’t be using that combination much since if you want the largest gear in back, you’d be in the small ring up front. So you really just need enough chain to use the small ring with all but the smallest few gears, and the large ring with all but the largest few gears. This length would keep things from breaking if you use this combination accidentally.
It’s fine, you won’t normally ride this combo
You are also in a combo you may rarely use
This is ok. You should never cross-chain like this anyway. You only have to check if the chain is long enough to make this shift possible so the whole derauiler does not bind up, if you shift like this on accident.
Show us small-small.
You’re obviously at the limit on big-big, so let’s see if you could afford to add a couple links when it’s in small-small. It could be that adding a couple links would cause the cage to fold back on itself and rub.
as long as it’s running smoothly over both pulley wheels in the der, it should be okay. i doubt you’ll be riding in that gear anyways, so you most likely won’t hear any of the cross chaining noises
It’s perfect! Shimano strongly advises against using that combination: big cog and big chainplate. This bends the chain sideways, which compromises its durability. With a small chainplate, don’t use the two or three smallest cogs, and with a bigger chainplate, don’t use the two or three biggest cogs.