Flagship groupset goes high-tech for 2015
Shimano’s top-tier XTR groupset has always
been a money-no-object option for those who demand the ultimate in performance
and have correspondingly deep pockets. The latest version takes things to a
whole new level though. Not only have they finally launched an 11-speed option
to compete with SRAM’s hugely successful XX1 drivetrain but they’ve also
introduced an electronic version, complete with sequential shifting. This kind
of tech doesn’t come cheap though – the electronic rear mech alone will set you
back 635$.
11-speed
The new XTR is available
in electronic (M9050 Di2) and
non-electronic (M9000) versions.
Both have an 11-speed cassette with a wide, but not SRAM beating, 11-40t range.
Neither groupset is 1x11 specific like XX1 – and in fact, the electronic
version makes more sense with multiple chainrings up front – but there is a new
XTR single chainring with a special (but not narrow/wide) tooth profile designed
to help keep the chain on. Other changes include a new anti-friction coating, an
even lower profile rear mech and a new (optional) ‘sideswing’ front mech
design. Pricing is still to be confirmed.
Electronic
Shimano have adapted the Di2 shifting technology that’s proven
so popular on the road for us off-road types. The advantages include faster
shifting with reduced effort (you press a button rather than pushing a lever), mechs
that can self-correct to compensate for mud build-up and no cables to stretch or
stick. The biggest selling point is the sequential shifting though – you can
run just one shifter, and when you change gear the system works out what front
and/or rear mech movement is needed to maintain a good chain line. For XC
racers that could be a big plus, but with many trail riders switching to 1x
set-ups, will the extra weight, expense and complexity prove a turn-off? Only
time will tell. We certainly wouldn’t fancy pranging a 635$ rear mech though...
The system uses the same cranks, chain and cassette as M9000. Front mech 400$,
Rear mech 635$, Shifter 220$, battery and display TBC$
DI2 REAR MECH
The M9050 mech has a motor that’s 50 per cent more powerful than the one
you’ll find in Shimano’s Di2 road derailleurs in order to compensate for the
additional weight that mud can add to the components. It also has a clutch
mechanism to keep the chain under control.
CASSETTE
The 11-speed cassette has a carbon fibre spider and a mix of aluminium,
steel and titanium sprockets. Unlike SRAM’s 11-speed cassettes, which need a special
driver body, it’s compatible with all standard eight, nine and 10-speed
freehubs.
DI2 LCD DISPLAY
This shows information such as battery charge, gear position and shift
mode (whether or not sequential shifting is activated). It can also be integrated
with Fox’s electric iCD suspension adjustment system.
DI2 BATTERY
This can be mounted on bottle cage bosses, in the seat tube or even
within the steerer tube of certain forks, with all the wiring routed internally
through the frame.
CRANKSETS
The new XTR lets you choose between ‘trail’ and ‘race’ cranks, and
single, double or triple (except on the ‘race’ version) chainrings with titanium
teeth and a carbon fibre reinforcing structure.
DI2 SHIFTER
This may look much like a normal Shimano shifter pod but it actually
consists of a pair of switches that have been given a short yet positive throw
to replicate the feel of conventional shifter paddles.
DI2 FRONT MECH
The
M9050 front mech has the same ‘auto trimming’ technology as the company’s Di2 road
components. This means that as the chain moves up and down the cassette, the
derailleur’s cage is automatically adjusted to avoid chain rub.
