Shimano 105 R7000

Discuss light weight issues concerning road bikes & parts.
2lo8
Posts: 470
Joined: Thu Mar 31, 2016 10:32 am

by 2lo8

I was looking at pictures of RD-R7000 and the weight specs and noticed the rear linkage now appears to be cast. At first I thought it was aluminum and excited that 105 was finally going to get that upgrade, but then I noticed in some close ups, the A-knucle and rear linkage look almost like they're made of plastic now like a Simplex Prestige. The silver looks off on the silver version too, it reminds me of the silver Sora RD-3400 which had a silver painted plastic A-knuckle.

It also uses a flare-type pivot used on the plastic joints for Tourney, Altus, Acera, Sora, etc instead of all pressed in pins of the all-metal derailers. If you take a look at a Sora RD, you can see it uses a flared pin instead of a pressed pin when the plastic is on the outside, but not when it is inside. This is also what's found on Tourney etc. Combined with the newly cast instead of stamped steel rear linkage, it seems like it might be cost-saving plastic.

This is something I might expect from SRAM because of weight, but I always though of 105 as the no-nonsense durable construction groupset that only aimed to be not-heavy, not light. Is Shimano really downgrading 105 to use plastic like their lower end derailers? Anyone get their hands on one yet? I have to say I'm disappointed in Shimano if true.
[6.6kg of no carbon fiber]
[2lo8.wordpress.com]
Your one-stop source for information and reviews on cheap eBay bike junk.

ooo
Posts: 629
Joined: Sat May 21, 2016 12:59 pm

by ooo

Looks like Shimano removed cable sealing nose cover tongue from RD-R7000, that was in RD-5800/6800/R8000.
May be it is possible to retrofit using part Y5PV48000 from RD-R8000 (same part in RD-R9100 & RD-M9000)
(but, to be fair, this nose was also removed from XT RD-M8000)
Attachments
new.jpg
RD-R7000, RD-R8000
old.jpg
RD-5800, RD-6800
rd-5800-y5ye98030.jpg
RD-5800 sealing nose cover tongue (part of cable adjusting unit)
xtr-da-ultegra-Y5PV48000.jpg
RD-R8000 sealing cover tongue (also RD-R9100, RD-M9000)
xtr-da-ultegra-Y5PV48000.jpg (5.95 KiB) Viewed 1086 times
'

by Weenie


User avatar
themidge
Posts: 893
Joined: Fri Jan 13, 2017 4:19 pm
Location: yer ma

by themidge

Actual weights and good pictures in this bike radar article:
https://www.bikeradar.com/road/news/art ... ils-52035/
To be honest, I think you could easily mistake it for Dura Ace from a distance, which has got to be a good thing!

User avatar
F45
Posts: 898
Joined: Wed Jun 08, 2011 6:08 am

by F45

Hubs still suck, and still hyperglide. But otherwise looks fine.

ooo
Posts: 629
Joined: Sat May 21, 2016 12:59 pm

by ooo

2lo8 wrote:
Tue May 15, 2018 6:24 am
ooo wrote:
Mon May 14, 2018 5:55 pm
FC-R7000 50-34T: 713.4 (FC-5800 757) -43.6g
FC-R7000 52-36T: 742.6 (FC-5800 773) -30.4g
FC-R7000 53-39T: 757.8 (FC-5800 776) -20.2g
I thought FC-5800 was more like 730-745g. Those numbers look too high to me.
Anyone knows weight of crank arms only for FC-5800 or FC-R7000?

Looks like most weight reduction comes from chainrings ramps:

Image
'

2lo8
Posts: 470
Joined: Thu Mar 31, 2016 10:32 am

by 2lo8

Those parts are plastic I think, so there's very little weight reduction by reducing that.

Speaking of which, I bought a RD-R7000 to poke with a soldering iron. It's plastic.
[6.6kg of no carbon fiber]
[2lo8.wordpress.com]
Your one-stop source for information and reviews on cheap eBay bike junk.

TheKaiser
Posts: 541
Joined: Thu Sep 05, 2013 3:29 pm

by TheKaiser

2lo8 wrote:
Sat Oct 13, 2018 7:31 am
Those parts are plastic I think, so there's very little weight reduction by reducing that.
Wait, which parts are you talking about here? The rear derailleur knuckle and link that you referred to before, or something else?
2lo8 wrote:
Sat Oct 13, 2018 7:31 am
Speaking of which, I bought a RD-R7000 to poke with a soldering iron. It's plastic.
Sounds like you confirmed the derailleur materials in person. What was your overall impression of the quality? Still disappointed in Shimano? Asking as I am looking at a new "Every Day Driver" build and am a bit on the fence between 105 and Ultegra. Have ridden older versions of 105 in this application in the past and been satisfied overall, but was wondering if the upgrade to Ultegra is justifiable this time around or not. I'm still hoping for some real world tire clearance comparisions too. I had heard a rumor that 105 calipers had more clearance than Ultegras (I'd be using non-direct mount rim calipers), which would be a plus for this application.

2lo8
Posts: 470
Joined: Thu Mar 31, 2016 10:32 am

by 2lo8

TheKaiser wrote:
Sat Oct 13, 2018 8:40 pm
2lo8 wrote:
Sat Oct 13, 2018 7:31 am
Those parts are plastic I think, so there's very little weight reduction by reducing that.
Wait, which parts are you talking about here? The rear derailleur knuckle and link that you referred to before, or something else?
2lo8 wrote:
Sat Oct 13, 2018 7:31 am
Speaking of which, I bought a RD-R7000 to poke with a soldering iron. It's plastic.
Sounds like you confirmed the derailleur materials in person. What was your overall impression of the quality? Still disappointed in Shimano? Asking as I am looking at a new "Every Day Driver" build and am a bit on the fence between 105 and Ultegra. Have ridden older versions of 105 in this application in the past and been satisfied overall, but was wondering if the upgrade to Ultegra is justifiable this time around or not. I'm still hoping for some real world tire clearance comparisions too. I had heard a rumor that 105 calipers had more clearance than Ultegras (I'd be using non-direct mount rim calipers), which would be a plus for this application.
I've been doing some more digging, and it turns out Ultegra R8000 is plastic too, I just never noticed because I never buy Ultegra and it wasn't on my radar. The parts that are plastic are the inner link and the A-knuckle (the one with the pulley cage). Clearly a cost-cutting measure because Dura-Ace is still aluminum. I did a write up on my blog, but I have a 10 year old shadow SLX(105 equivalent) to compare it to. The 'direct-mount' pivot bolt was noticably sloppier on 105. I'm under the impression Shimano did a big round of cost cutting with the road shadow revamp to pad their margins.

I'm sure it's still usable, but this is coming from someone that has a handful of Tourney derailers (my standards aren't so low that I think Tourney works well in comparison to better) and thinks newer Sora works pretty good. I use some SRAM too, which uses plastic. It's really not at all what I expect from 105 though. I tolerate it on SRAM because that's WW stuff. I expect durability from 105 due to the weight penalty.

It's not worth the price difference, but that's because R8000 is also plastic, apparently. I don't dislike shadow, but I think RD-5800 is better built. If it were like the 10 year old SLX, except with road 11 actuation, I wouldn't have any issues with it.
[6.6kg of no carbon fiber]
[2lo8.wordpress.com]
Your one-stop source for information and reviews on cheap eBay bike junk.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post