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Thread: So Di2 for MTB

  1. #1
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    So Di2 for MTB

    Freaking awesome. Just put it on my ASR and wow, I dont think I can go back to a normal shifter. I upgraded from XX1.
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    I demoed a Scott Spark today with Di2 and it's definitely the real deal. I'm happy waiting until this tech becomes more accessible (i.e. cheaper) but I was definitely impressed. I liked the crisp and quick shifting and the light but direct touch of the levers. I definitely wouldn't want to crash with such expensive components though lol

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    LOL I'll try my best not to crash. It would be costly.
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    I picked up a Pivot Mach4 with Di2 2x last week and agree it is a solid option. Riding around in the neighborhood I was not really impressed. However, once I hit the trail, I realized just how good it is. Perfect shifts everytime, and the feel of the lever is excellent. I am running the Synchro mode with one shifter and it does feel very much like my XX1 setups. I find the Shimano cassette ratios are much more to my liking. With the XX1 setup, I often wish for a different gear. I like rhythm step, nice work Shimano. Hopefully the tech will trickle down as I think the 1X game will change a bit.

    Glad to see other riders out there diving in and giving Di2 a try.
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    Even though I have never tried Di2 on a mtn bike, I was REALLY impressed by how Di2 made the front derailleur on a road bike work like butter.

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    Apart from the fast shifts, I felt that I barely had to come of the power when pedaling uphill to be able to downshift. I demoed another bike right after with XX1 and the difference was noticeable in how much more and longer I had to ease up when downshifting in climbs through the same sections of trail.

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    Quote Originally Posted by matadorCE View Post
    Apart from the fast shifts, I felt that I barely had to come of the power when pedaling uphill to be able to downshift. I demoed another bike right after with XX1 and the difference was noticeable in how much more and longer I had to ease up when downshifting in climbs through the same sections of trail.
    Yeah this is so nice. You don't have to think about shifting anymore. It just happens every time.
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    Quote Originally Posted by matadorCE View Post
    Apart from the fast shifts, I felt that I barely had to come of the power when pedaling uphill to be able to downshift. I demoed another bike right after with XX1 and the difference was noticeable in how much more and longer I had to ease up when downshifting in climbs through the same sections of trail.
    I haven't really experienced this yet as I am so programmed to lighten up on the pedals before shifting. I'll have to give it a go on today's ride.
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    Love Di2 on my road bike, would probably also love it on my mountain bike. Pivot is the only company that looks to have a well designed battery storage solution. Where is everybody placing the battery on their Di2 setups? Dropper posts obviously don't allow to run the battery in the seatpost like you would on a road bike.

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    Patiently waiting for it to trickle down into the xt/slx realm, see y'all in a few years!

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    Quote Originally Posted by J.B. Weld View Post
    Patiently waiting for it to trickle down into the xt/slx realm, see y'all in a few years!
    Same here.
    Quote Originally Posted by Mr Pig View Post
    Avid is spelled wrong, there should be an 'O' in there.

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    Quote Originally Posted by bigdrunk View Post
    Love Di2 on my road bike, would probably also love it on my mountain bike. Pivot is the only company that looks to have a well designed battery storage solution. Where is everybody placing the battery on their Di2 setups? Dropper posts obviously don't allow to run the battery in the seatpost like you would on a road bike.
    The "standard" bottle cage mount is a good, unobtrusive design for retrofitting. If you want something cleaner, you can drop a battery in the steer tube with a PRO Tharsis, and have access to hidden routing if you use a Tharsis handlebar.

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    Quote Originally Posted by wschruba View Post
    The "standard" bottle cage mount is a good, unobtrusive design for retrofitting. If you want something cleaner, you can drop a battery in the steer tube with a PRO Tharsis, and have access to hidden routing if you use a Tharsis handlebar.
    Guess the is another thing I am holding out for is frames for di2 becoming more available.
    Quote Originally Posted by Mr Pig View Post
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    Quote Originally Posted by J.B. Weld View Post
    Patiently waiting for it to trickle down into the xt/slx realm, see y'all in a few years!
    Same here, and maybe wireless ... although XTR M9000 is like butter set up with low clutch resistance ...

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    Quote Originally Posted by matadorCE View Post
    Apart from the fast shifts, I felt that I barely had to come of the power when pedaling uphill to be able to downshift. I demoed another bike right after with XX1 and the difference was noticeable in how much more and longer I had to ease up when downshifting in climbs through the same sections of trail.
    How does di2 behave when you try to downshift when you are standing climbing up a steep gradient?

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    Yeah, a gruppo thats the same price as a high-end complete MTB is really too much for anyone. And I'd almost be too scared to take it out on the trails.
    Rimmer - "There's an old human saying - if you talk garbage, expect pain"

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    Quote Originally Posted by AlexRandall View Post
    Yeah, a gruppo thats the same price as a high-end complete MTB is really too much for anyone. And I'd almost be too scared to take it out on the trails.
    No it is not the same price. Not even half. Life is all about risks, learn to manage them.



    Quote Originally Posted by ac1000
    How does di2 behave when you try to downshift when you are standing climbing up a steep gradient?
    It shifts just as nice as being on flat ground.
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    Quote Originally Posted by irishpitbull View Post
    It shifts just as nice as being on flat ground.
    holy shit, that is awesome. how is that feature not more marketed?

    Learning how to time shifts in advance is a skill that actually took some time to get really good at and I still occasionally botch it and just deal with grinding up hill in too hard a gear because there is no way out without dismounting.

    Can't wait for how every many years it takes for it to come down to my budget

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    For me as a xc racer di2 in a 1x makes no sense. The "magic" happens with 2x and synchro. I've been on a 1x10 and 1x11 for years, race Cat 1, and ride/race 50 milers and longer with 8000 ft gain or more. A 2x, even as unfashionable as it is, makes more sense for me. The cassette spacing on a 11-40 is perfect with a 36/26 crank or even 34/24 for nasty 100 milers. That 11-40 cassette is useless in a 1x for me, but I'll gladly take a di2 2x setup. As for cost you can ebay or order overseas for about 50% of retail. I'd like SRAM's new etap wireless but that's a ways down the trail, but probably sooner than xt di2. I run my battery mounted under the water bottle cage. Looks just like my mini Lenzyne pump, but not having wires and battery and junction box would be nice. I held off on di2 road for years and now I'd never go back to mechanical on the road.

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    Quote Originally Posted by westin View Post
    For me as a xc racer di2 in a 1x makes no sense. The "magic" happens with 2x and synchro. I've been on a 1x10 and 1x11 for years, race Cat 1, and ride/race 50 milers and longer with 8000 ft gain or more. A 2x, even as unfashionable as it is, makes more sense for me. The cassette spacing on a 11-40 is perfect with a 36/26 crank or even 34/24 for nasty 100 milers. That 11-40 cassette is useless in a 1x for me, but I'll gladly take a di2 2x setup. As for cost you can ebay or order overseas for about 50% of retail. I'd like SRAM's new etap wireless but that's a ways down the trail, but probably sooner than xt di2. I run my battery mounted under the water bottle cage. Looks just like my mini Lenzyne pump, but not having wires and battery and junction box would be nice. I held off on di2 road for years and now I'd never go back to mechanical on the road.
    Agreed. I love my XX1 setups, but DI2 in 1X really doesn't make any sense. Running Synchro mode with your choice of chainrings is the real benefit. I love the Rhythm Step cassette, and the shadow derailleurs are much more protected than their SRAM counterparts.

    Has SRAM even announced a MTB group?
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  21. #21
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    My wife just gave me one of her old bikes which has Di2 on it. I have only done a couple of rides but I am blown away.

    The ability to grab a bunch of gears in a hurry is unmatched. I come down a descend straight into a steep climb hold down the shifter and I am in the gear I want. It is impressive.

    Combine Di2 it with the Fox icd stuff and you have a pretty cool set-up.
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    Quote Originally Posted by westin View Post
    For me as a xc racer di2 in a 1x makes no sense. The "magic" happens with 2x and synchro. I've been on a 1x10 and 1x11 for years, race Cat 1, and ride/race 50 milers and longer with 8000 ft gain or more. A 2x, even as unfashionable as it is, makes more sense for me. The cassette spacing on a 11-40 is perfect with a 36/26 crank or even 34/24 for nasty 100 milers. That 11-40 cassette is useless in a 1x for me, but I'll gladly take a di2 2x setup. As for cost you can ebay or order overseas for about 50% of retail. I'd like SRAM's new etap wireless but that's a ways down the trail, but probably sooner than xt di2. I run my battery mounted under the water bottle cage. Looks just like my mini Lenzyne pump, but not having wires and battery and junction box would be nice. I held off on di2 road for years and now I'd never go back to mechanical on the road.
    I thought the same thing until I purchased it it. I will never use a cable shifting bike again.
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    I'm really not interested until its wireless. To me, it seems inevitable that we will look back in a few years and laugh at the bulk of today's Di2. I can't afford to be an early adopter on this one -- especially when the XTR/XT 1x11 set up is just so good.

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    Wireless would be really cool, but I found with the Di2 on my road bike, you hardly notice the tiny wires with internal cable routing. Also, having to keep one battery charged/changed would be easier than dealing with four (one per derailleur and each shifter). Battery life on SRAM wireless is supposed to be excellent though.

    The battery life on Di2 is insane.

    I would be interested in putting Di2 on my MTB, but it would have to be an XT version (like Ultegra on my road bike). $600 for an XTR rear derailleur is flat out nuts. I think I paid $150 for my Ultegra RD from BikeDiscount.de

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    Agreed that wireless is were the electric shifting technology needs to go. I'd hate to cut a power cable and be stranded, plus with the current trend of cleaning up the bars and making things simpler and easier/faster it only makes sense to get rid of cables.

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    Quote Originally Posted by matadorCE View Post
    Agreed that wireless is were the electric shifting technology needs to go. I'd hate to cut a power cable and be stranded, plus with the current trend of cleaning up the bars and making things simpler and easier/faster it only makes sense to get rid of cables.
    Di2 Frames are internally routed, there is next to zero chance of cutting anything. Also the cable unidirectional, so if did get cut you can splice it very easily. The cable follows the brake line so there is no clutter, also the shifter is smaller so you are shrinking the footprint of there decluttering (SP?) the cockpit.

    Wireless would need a much larger batter capacity, Per Shimano also with power meters heart rate straps, bluetooth headphones, cross talk could be a problem.
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    Quote Originally Posted by bigdrunk View Post
    Love Di2 on my road bike, would probably also love it on my mountain bike. Pivot is the only company that looks to have a well designed battery storage solution. Where is everybody placing the battery on their Di2 setups? Dropper posts obviously don't allow to run the battery in the seatpost like you would on a road bike.
    I wrote this up the other day: http://forums.mtbr.com/drivetrain-sh...up-994236.html

    The second gen mod has the battery in the steerer tube, working really well and you save on the cost of the external battery case/ junction box.
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    "but DI2 in 1X really doesn't make any sense"

    Completely disagree, the speed and precision of the shifts is worth it alone. Whether it is worth the money for one's budget is a separate argument.

    I agree that one would see a more marked improvement over cable shifting with a 2x setup as the improvement on front derailleur shifting is even more impressive than that of the rear derailleur, and the syncro is just mind blowing.

    For the chap that proposed the Tharsis option, great if you are roadie/ XC chappie but a lot of us are running shorter stems than 80mm these days and this is one area that Shimano/ Pro are lagging behind (as well as only offering a relatively narrow, flat bar). Modern trail bikes are designed with longer front ends and shorter stems (40-60mm). That said my cockpit setup is still pretty neat.

    11-40T for 1 x 11 does seem a bit limiting but again it depends on where one lives. I have no ego problems running a 30T front because our climbs are steep. I am still running my XX1 cassette because the M8000 XT 11-42T has only just become available and all my rear wheels are still set up for XD driver.

    And if I am doing more than 37 kmph on a descent then I am not pedalling because my legs are too busy working the terrain. But then we have almost no fire road in our trail network and I don't care if it takes me 2 minutes longer to get to the trail head (of the proper trails) because I only have 30 x 11 or 30 x 10 as my highest gear.

    Overall Di2 on a mountain bike is so good that I am looking to get another bike just so I can run a 2 x 11 system and reap the full benefit, might even be a 29"-er!!

    In 1 x 11 I will soon add the XT 11-42T cassette to my set up as I like to have a 42T as a bail out gear for when it gets really steep and the range just feels more natural than SRAM.

    In 2 x 11 I will use the XTR cassette as I can choose my front chain rings to compliment that spread, let the syncro do the work and enjoy the longevity that comes with a Ti cassette.

    Happy trails.
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    Truly ingenious and well thought out. Thanks for taking the time for writing it up.

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    Quote Originally Posted by westin View Post
    Truly ingenious and well thought out. Thanks for taking the time for writing it up.
    You are most welcome. Figure others might as well save time and money (parts and e-tube lengths) from the experience of my tinkering.
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    Quote Originally Posted by irishpitbull View Post
    No it is not the same price. Not even half. Life is all about risks, learn to manage them.
    .
    No, its the best part of 4-5K by the time it hits Aus. Thats pretty top end really. I bought my XX hardtail for 5K (ok, end of season price but still current drivetrain at the time)

    And whats this 'risks' argument, sounds like a bit of post padding to me.
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