Intro & First Impressions
Back in June of 2025, Shimano released XT and Deore-level Di2 drivetrains. The years of waiting for cord-cutting were finally over. Shimano developed a wireless protocol that would allow for hybrid drivetrains that can mix drop and flat bar parts seamlessly. XTR and XT stay in the top two tiers but Deore has been promoted since SLX has been discontinued. If it was me, I would have kept SLX and eliminated Deore as it has always been a bit of an outlier. Uncle Dave has been putting the miles on XT stuff since its debut in June. I received the Deore 6200 Upgrade kit, cranks and brakes, a couple of weeks ago, to install and test on the long travel bike this winter.
Winter is not kind to bike parts in general, let alone those with batteries, so I am going to do my best to expose them to all the elements,
Shimano Deore RD-M6250-SGS
A Deore Di2 Gruppo is not a thing
Shimano didn’t run to the lab to cook up an entire Deore group to release with XT and XTR. Those levels have an entire ecosystem, from wheels to cranks. Deore is a developing story that borrows the most exciting elements of Di2: the Shifter and the Derailleur. This splits Deore’s numbering system in two.
The 6100 family includes cranks, cassette, chain, bottom bracket and brakes. The 6200 family is the derailleur and the shifter on its own and it’s backward compatible to the last generation of chains, cassettes and rings.
One rather unplanned side effect of this generational compatibility is the chainring. The new XT and XTR chainrings are made of aluminum. While alloy is a great material for feel, weight and noise reduction, the lifespan is not the best, particularly when faced with a constant barrage of mud and sand compounded by mechanical negligence. The steel construction of the previous generation is my preference and is absolutely the choice for fit-and-forget maintenance.
Brand new on the left and 4500kms on the right. There is absolutely no other chainring I would rather have than steel!
The Deore upgrade kit consists of the derailleur, shifter (I-SPEC or clamp), quick link, a 305mAh/2.32Wh battery and a charger with a USB-C cable. This tidy kit is ready to bolt onto your standard hanger or UDH frame in seconds. There is no denying the upfront convenience of wireless shifting setups. Bolt, cut, snap, pair and ride. If you can follow basic instructions, you can get rolling pretty quickly. While I am more familiar with the SRAM App to pair and update AXS components, the Shimano E-Tube app is just as intuitive to navigate. One thing I really dislike is the inability to shift through the gears while in the app. The derailleur won’t take commands from the shifter when it is busy talking to your phone. This is a habit I will have to unlearn.
The SW-M6250-IR I-SPEC shifter lacks the adjustments of the XT and XTR, but still has a fantastic haptic feel. The third button can do many custom functions, including controlling your Garmin or bluetooth enabled lights. I set mine up for micro-adjusting the derailleur until I find a better use for it.
The shifter itself is a simplified version of the XT and XTR units. On the XTR, you have 3-way adjustability of the paddles with the quick access bolts. On the XT, you have 2-way adjustability for a functional downgrade. The Deore shifter only gives you the range you get from the I-SPEC mating to the shifter or the clamp on your handlebars. I would have preferred the clamp option, but it wasn’t available yet. In the past, it was possible to buy a conversion kit from Shimano to go between the clamp and I-SPEC but despite all my searching on the Shimano B2B site, I haven’t managed to locate this part.
The shifter itself has plasticky feel. While it doesn’t seem particularly fragile, the odds of it surviving a crash seemslower than with XT or XTR. I have no scientific data to support this theory. Armchair engineer here.
The battery door mechanism is growing on me. As Uncle Dave pointed out, it feels precise, and this could be its Achilles heel
The battery has no electrical connection without the cover pushing it up into the contacts. If you lose the cover on a ride, you will have to get creative.
Contacts are hidden from the elements well.
The drivetrain that came off the Orbea consisted of an Eagle AXS X01 derailleur and Shifter along with an XT 8100 10-51 Cassette and an XTR 9100 Chain. I believe this to be the Goldilocks shifting combo for pedal bikes. If the Shimano derailleur can handle the heavy lifting the SRAM X01 has been doing for me in the last few years, this balance may shift towards the blue corner. I like that Shimano offers its derailleurs in two cage lengths. The mid cage works great on their new 9-45t cassette, and paired with a 28t chainring (if your chainstays allow for it), it may be the golden ticket to a lightweight, low-profile shifting setup. Shimano has done its rock avoidance homework and engineered the new derailleurs to be significantly less obtrusive than SRAM’s T-Type. While the midcage option is only reserved for XT and XTR derailleurs, the 11sp Linkglide wired-in eMTB option is available for Deore 6200.
A 518 gram Deore derailleur
A 394 gram X01 derailleur
The 786 gram Deore Crankset
And a 651 gram XT crankset
I will also experiment by having the Shimano Deore components drive a SRAM X01 Chain and Cassette. If this combination works, we may have a really good contender for a long lasting and lightweight shifting setup. As good as the quality of shifting is with Shimano Hyperglide+ cassettes and chains, their lifespan is noticeably shorter than SRAM’s counterparts. Speaking of lightweight, Deore is anything but. The cranks weigh in at 786 grams compared to the XT cranks at 651 grams. The all-steel cassette also weighs quite a bit more. There is no doubt the Deore Cassette will last a long time, but the added weight is going to affect your suspension performance negatively.
High and Low limits are clearly marked. The B-tension screw hides higher up in a little crevice. Your trailside tools may not be able to access it.
Small footprint and bigger capacity than the SRAM battery.