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Dura-Ace Di2 R9150 Groupset Lifespan

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Dura-Ace Di2 R9150 Groupset Lifespan

Old 04-24-21, 11:43 AM
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kosmo886
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Dura-Ace Di2 R9150 Groupset Lifespan

Considering a bike with this setup used. What is the typical lifespan of these before wear issues etc.?
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Old 04-24-21, 12:09 PM
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Depends on which parts you are asking about.
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Old 04-24-21, 03:00 PM
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8787mi. Exactly. Then everything goes to hell.
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Old 04-24-21, 03:18 PM
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Originally Posted by cxwrench View Post
8787mi. Exactly. Then everything goes to hell.
I must of been lucky with mine. I got to 8796.
Was really hoping to break the 8800 mark, but it just wasn't to be.
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Old 04-24-21, 03:36 PM
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Ok I will take another crack at it. But depends on how much you abuse and/or maintain the components:

Chain: 3000 miles
Cassette: 7500 miles
Chainrings: 25,000 miles small, 30,000 miles big
Bottom Bracket: 25,000 miles
Derailleurs: 30,000 miles
Shifters/Brakes/Crankarms: indefinitely
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Old 04-24-21, 03:36 PM
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The shifters don't have mechanical parts that have wear issues. I don't hear much about derailers breaking either. Batteries die.
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Old 04-24-21, 07:48 PM
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8 years on DA di2 stuff, two different bikes, 25,000 miles between them. Lots of chains and cassettes, the latter mostly for gearing reasons or not catching chain wear soon enough. One battery, which was new at the time because I wanted the DN110 to add synchro - the original SM-BTR2 still works. That's it.
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Old 04-24-21, 10:48 PM
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This is a fun instagram account for broken Shimano crank arms and such - https://www.instagram.com/thanksshimano/

I've got a Di2 9070 group that's closing in on 10k, zero issues beyond chain and cassette replacement. Everything else is still original. It's on my commuter and sees rain rides 4 months out of the year, I'd approximate 3000+ of those miles are in the rain.
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Old 04-26-21, 06:44 AM
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Originally Posted by kosmo886 View Post
Considering a bike with this setup used. What is the typical lifespan of these before wear issues etc.?
Expect to change the bottom bracket, chain, cassette, chain rings, and brake pads on the same mileage intervals you would with mechanical stuff.

The wires, junction boxes, derailleurs, shifters, and crank will last long enough (if not indefinitely) that you will likely replace the bike, or upgrade the components, before ever considering replacement. As one poster said there may be a mileage life span for the derailleurs, but on 4 bikes with Di2, I've never come across it...I have broken two FDs, but that had nothing to do with "wear", just "tear," it could have happened to mechanical derailleurs...

Do expect that the battery will be the highest wearing "Di2-specific" component.
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