Shimano Dura-Ace Di2
Mark_K
Posts: 666
So i see the big S have released a Di2 shifter to fit flat bars or at least for the tops of drop bars !!! So how long before we get the full fat MTB version ?
I'm kinda holding out on a new bike for gadget shifting on a 10speed shimano group set 20011/12 maybe !!!! 8)
Thoughts ?? :twisted:
I'm kinda holding out on a new bike for gadget shifting on a 10speed shimano group set 20011/12 maybe !!!! 8)
Thoughts ?? :twisted:
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well in a thread last month there were pics of the new 2011 xtr groupset, with everything minus shifters and brakes so who knows what the plan is
it also looks like everything above deore level will be 10 speed in 2011 cos with alivio now being nine speed it makes sense. now we have to wait to see what sram do 
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Will they be 2 x 10 or 3 x 10? there really is no need for 30 gears surely?!0
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I'll be surprised if they don't bring out a electronic shifting sooner rather than later tbh, especially as its been so well received on the road bikes !
Surely its just a case of making sure the waterproofing and anti shock properties are up to scratch for off road use ?0 -
nah, tbh, i'm thinking i might run 3*11 with campag and the campag flat bar shifters...0
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Surely it's extra weight though? I know SRAM have the fancy machined cassette made from one block of metal but it would be even lighter with a 9 speed! Maybe I'm just old school, my bike still has 8 speed and I've never felt the need for any more.
With the electronic side of the shifting will it end up lighter? I know the battery packs are very light, would it eliminate the need for such heavy duty springs? Be interesting to see how it compares in weight0 -
well the cogs have to be made thinner so they can fit the extra in, so the weight difference is bairly noticable. the only reason sram cassettes are so much lighter is because of the machining process they go through, and i imagine shimano are coming up with a way to beat it0
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People already running Di2 on mtb's...eg
http://fairwheelbikes.com/forum/viewtop ... =49&t=66140 -
OK, that bike looks the nuts! I can see the attraction with the electronic system 8)0
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The new Di2 satellite shifters plug into the STIs, so they're not really any more useful than the existing one, you'd still need to heavily modify them to work on flat bars.
The 2 bikes that Fairwheel bikes have done are pretty impressive. The spec sheets for M980 etc that appeared on Weight Weenies don't suggest any sort of electronic shifting this generation, I reckon they'll hone it a bit more on the road before taking it off road.
The weights are coming down anyway and the ability to go 2x10 with wider ratios than a 3x8 (and comparable to 3x9) system offsets the extra weight of the extra sprockets.
Saying that... if anything I prefer the 9 speed 28/40 with 11-34 cassette on my hardtail vs the 28/42 with 11-36 XX set up on my FS.0 -
I'd still like to see an affordable lightwieght hub gear system in the future, no mechs, straight chainline, could be electronically controlled, single chainring up front or a more highly developed one like the hammerschmidt. As discussed elsewhere on the forum. Also with only one cog on the rear it would stop the need for the wheel to be dished as much. It's a long way off yet being a race weight but could it be a possibility in the future?0
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It's always going to be heavier than a regular hub, and as rotational weight it's in a bad place.
That said, it would be great. If money was no object I'd make myself a mug-plugging bike with one of the new 11 speed alfines.0 -
But it's the centre of the wheel. Best place for the rotational weight.GHill wrote:It's always going to be heavier than a regular hub, and as rotational weight it's in a bad place.
That said, it would be great. If money was no object I'd make myself a mug-plugging bike with one of the new 11 speed alfines.Boo-yah mofo
Sick to the power of rad
Fix it 'till it's broke0 -
How about a single freewheel at the back then the gear unit at the front like a hammerschmidt but with all the ratios in there? If someone's allready doing that just ignore me lol. I can't help thinking a chain in a straight line would be more efficient and harder wearing too. If all the weight is at the middle of the bike an thus more central surely that would be better?0
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i know at the moment it might not be that plausible but everything has to start somewhere, rememeber where rear mechs started:
http://www.classiclightweights.co.uk/campagnolo.html
see Paris Roubaix
Come on a wee bit since then0 -
Paul 8v wrote:How about a single freewheel at the back then the gear unit at the front like a hammerschmidt but with all the ratios in there?
Sounds a lot like the gearbox bikes that people were playing around with a couple of years ago. The Honda DH bike being a prime example (and not actually sold).0 -
Cool, I've been out of the picture in mountain biking for a few years so I wasn't sure if that sort of thing had been done, with a gearbox type system you could even employ a prop shaft arrangement rather than a chain, I'm sure I read about a propshaftbeing run in/along a rear swingarm somewhere, that would be pretty cool0
