Shimano di2
 

Shimano di2

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I'm loving this new to me as slick as a btcc sequential gear change until tonight 

All was going great until I had a wee coup de grace or more like a coup on the grass , nothing too bad but the gears stopped playing and 8 miles in top gear didn't half knacker my legs in the intense rain that just seem to appear to make me suffer

Anyway warmed up and eventually found the junction box, gave it a wee tickle not sure if it was that but spinning the cranks while playing with the levers it was like the telly and lights bursting in to life after storm Arwyn my gear shift has returned, it made my night 

Anyone else had crash mode sprung on them on a dark ,wet November?


 
Posted : 12/11/2025 10:34 pm
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I’ve had it happen twice on my XT Di2 once changing gear through a stream with a lot of chain slap the other was just random no reason

 

First time I had to lift the rear wheel and cycle through all the gears . 2nd time it worked just getting back on the bike

 

It’s a mechanical crash detection system apparently.

 

According to a man from Shimano correct procedure is to spin the cranks and go up and down the cassette to get it working again. It’s just a shame they don’t actually tell you this anywhere (or at least they didn’t) 


 
Posted : 13/11/2025 7:06 am
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how do you go through the gears if it's not working ? 


 
Posted : 13/11/2025 8:59 am
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You're stuck in the wee cog, until you can get it reset as it goes to sleep and your legs are burning 


 
Posted : 13/11/2025 9:19 am
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Had this with a riding pals gravel bike the other week, we found that lifting the rear wheel, spinning the cranks and manually pushing the rear mech up and down the cassette seemed to wake it up and reset things, eventually… 


 
Posted : 13/11/2025 9:41 am
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Posted by: iainc

manually pushing the rear mech up and down the cassette

Aaah, thanks - makes sense.  (I have old di2 on a roadie that just needs the button on the junction box holding down)


 
Posted : 13/11/2025 10:41 am
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