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brando

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Posts: 35
Reply with quote  #1 
I am building up a steel Kona Rove with 135mm QR rear spacing. I have already put RS685 brake/shift levers on it. I still need a front derailleur. I read in the R8000 description that it is somewhat optimized for wider rear hub spacing. However, is this optimal with the RS685 shifters or is it better to stick with 5800/6800 for that shifter?

It will be pushing a few different chainring setups: 50/34 compact, 46/30 sub compact, and 46/34 for cross (if I ever do it).

I also need a rear derailleur, but I think either R8000 or 5800/6800 would be fine?

Thanks!
Brando
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dangle

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Posts: 257
Reply with quote  #2 
Brando,

Grab the newer style. The idea that it's optimized for wider rear hub spacing is kind of nonsense, but it does have a couple perks over the older style. The biggest thing is that rear tires were constantly rubbing the long arm of the 5800/6800 type front derailleur. The new style doesn't use that long arm so tire clearance isn't an issue. There's also a barrel adjuster added for fine tuning. It's really a nice front derailleur. Since the cable pull is identical to the previous series, there's not going to be any reason that it would operate in a less-than-optimal fashion with the 685 shifters. The rear derailleur can be whatever you want it to be. You may hear people talk about the R8000 RD being able to handle a larger rear cog better, but the 5800/6800's handled much larger cogs than advertised. It appears that it may stick out a little less than the previous generation which would help with sticks and brush catching it. There's only a $10 or so price difference, so it seems like matching would make sense unless you already have one ready to go.
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brando

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Reply with quote  #3 
Thanks, this is great info - the stays may be long enough on the Rove to clear the longer arm, but ample clearance here will be nice. My local shop has the R8000 anyway so easy to grab and install. I think the shadow type mount makes the R8000 rear attractive so I'll probably go with that too. Cheers!
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cpark

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Posts: 14
Reply with quote  #4 
I agree with dangle.
The older model Shimano FD is not comparable with the newer model Shimano crankset, where newer model FD is compatible with with old/new FD.

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brando

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Posts: 35
Reply with quote  #5 
I found that Shimano made a running change to 105 and introduced FD-5801 which is like the R8000 front derailleur (no long arm anymore, etc), so I decided this will work great. 
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