Ibis announces the Mojo HDR

by Brian Mullin on June 10, 2013

Like it Both Ways”, which way do you swing, 26″ or 650b? I had known
about the new Mojo HDR multi wheel sized bike since the Sea Otter
festival, but I had been sworn to secrecy not to divulge anything.

the cat is out of the bag, and Ibis unveiled the new new Mojo HDR beast to the world,
which is an updated or evolutionary version of their Mojo HD, and still
shares the superb DW Link suspension. The greatest addition this bike
has over its predecessor, is that it allows convertibility via their
limbo chips between a 26-inch based wheel with 160mm of rear travel
(a.k.a. the HDR) and a 27.5-inch wheel with 130mm of travel (HDR 650b).
This conversion capability was designed and built into the bike, so
that the geometry and suspension function and work properly together,
for a synergistic 26-inch and 27.5-inch package. Both of the variants
use the same exact frame, and only the limbo chip and rear shock need to
be swapped for the correct setup (and obviously wheels and fork).

HDR Highlights:

  • 26″ and 27.5″ convertible
  • Slightly frame stronger than HD
  • ISGC mount compatible
  • Fits larger variety of rear shocks – FOX Float X and XV
  • .3 -.4 lbs lighter than HD
  • Increased rear end clearance for 11-speed gearing
  • Upgraded linkages

to its HD brethren, the new frame, which was built with a new molding
process, is lighter and stronger, yet retains the same stiffness. They
shifted over the lower link to make room for the always coveted ISGC
mount, and in addition they added more robust bearings to the link to
take more abuse and increase their longevity. More room was added in the
rear axle area for the wider 11-speed systems, so clearance issues with
rubbing and fitting will not be a problem. Additional space was created
around the rear shock, so that the larger piggyback designs, such as
the FOX XV and Float X will fit.

In the 130mm HDR 650b mode/version you can run it with 130-140mm travel forks, while with the 160mm HDR, you can use 160-180mm lengths. The HDR can pretty much run any size 26-inch tire, but the HDR 650b is constrained to a maximum of most 2.35-inch tires, so we’ll have to see how the fatter Enduro type tires fit, and it appears that Ibis might make some slight modifications for that accommodation. The frame will fortunately allow you to run a HDR 650b in 160mm mode if you desire, but it will require the rear shock to have travel a limiter via a a 5mm spacer to keep the rear tire from hitting the seat tube. Later in the year Ibis will offer a separate rear triangle to retrofit the current HD for a special 650b configuration.

Mojo HDR has a tapered headtube, threaded bottom bracket, 142mm rear
TA, integrated direct mount front derailleur, comes in Reverse Vitamin P
and Cobra Blue colors, and the frameset retails for $2699.99. The full
bike kits are the SLX $4699, XT $5599, XTR $6999 and XX1 $6499. The HDR
650b has a 67.1º head angle with a 140mm fork and 67.6º with a 130mm,
and chainstay length at 17.1″, bottom bracket height (w/ Neo Moto
2.3-inch tires) at 13.5″ with 140mm fork and 13.4″ with 130mm, and a of
weight 6.2 lbs. The HDR has a 67.5º head angle with a 160mm fork and 66º
with a 180mm, and bottom bracket height at 13.8″ (unknown BB on the

Mojo HDR 650b
The Mojo HDR 650b is the fraternal twin brother of the Mojo HDR
and the younger brother of the Mojo HD, taking the HDs technology and
versatility a few steps further. As you can tell by the name, the HDR
650b features that third wheel size that all the kids are talking about
these days: 650b / 27.5″.

Features of the Mojo HDR 650b

  • 650b (27.5″) Wheels
  • dw-link Suspension
  • 130mm of rear wheel travel
  • Shock specs: Fox Float CTD Adjust Factory Series with Kashima Coat, 7.875″ x 2.0″
  • ISCG 05 compatible
  • Weight for the frame and shock, size medium, matte finish: 6 lbs
  • 67.1 degree head angle with a 140mm fork
  • Optional polycarbonate down tube cable guard
  • Chain stay length: 17.125″
  • 12 x 142mm Maxle rear axle
  • 160mm post mount left dropout, carbon fiber
  • Tapered Head Tube and Steerer
  • Compatible with Chris King InSet 3 headsets
  • Up to 2.35″ rear tire depending on brand and height of cornering knobs
  • Dual
    row angular contact bearings in the front of the lower link that have
    less play than standard sealed bearings. Preload adjustment is not
    necessary. Large 28mm x 15mm x 7mm radial bearings in the rear for
    stiffness and long wear
  • The Bottom Bracket height is 13.5″
  • Front derailleur (if you use one) and adjustable seatpost housing (if you use one) run along the top tube
  • Direct mount front derailleur

The Frame
The HDR frame is slightly lighter than the HD, around .3 -.4 lb
(depending on size and color), yet is stronger and of equal stiffness.
We’ve employed a new, more precise molding technique similar to that
used in the Mojo SL-R to get the weight down.

By shifting around
our linkage locations, we’ve managed to add ISCG 05 chainguide mounting
functionality and dramatically increased the front derailleur
compatibility across both the 2X and 3X spectrum. We’ve also increased
clearance for the new 11 speed cogsets.

With some other tweaks to
the frame, we’ve made the frame compatible with Fox’s new lighter weight
XV air cans on the CTD shocks. We’ve also added clearance for their new
Float X piggy back shock.

The HDR is an extremely versatile bike. It can be setup a number of
different ways, for a number of different types of riding. You can
easily change front or rear travel and change wheel size to dial in the
right ride for you.

Note that the HDR and the HDR 650b share the
same frame. We change the stroke and length of the shock, along with its
location on the frame, to give two very different setups with unique
ride characteristics.

Our stock 650b setup has 130mm travel. By
swapping out the “limbo chips” and changing the shock, you can easily
change the bike to a 160mm travel bike for 26″ wheels. You can also run
the HDR 160mm setup with 650b wheels. You just need a travel limiter on
the shock (otherwise the tire will rub the seat tube), reducing it to
150mm of rear wheel travel. That version is called the HDR and you can
see it here.

Here is a picture of the limbo chips:

The HDR features a mixed tapered headset with a 1.5″ lower and a 1.125″
upper. The 1.5″ lower provides an exceptionally rigid front end
platform. Combined with the through axle fork and our very stiff front
end layup, you’ll be amazed at the precision found in the front end,
particularly when pushing hard. The HD is also compatible with the King
InSet 3 headset.

XX1 Clearance
With the popularity of the 11 speed cogsets on the rise, we’ve
increased the clearance at the drive side dropout to allow for most
hub/cassette combinations. We like the 11 speed drivetrains when
utilized with a  32 or 34 cog, they nicely match the suspension
kinematics that way.

We’ve managed to tweak things a bit in the linkage area of the bike to
make room for ISCG mounts. There’s a removable plate if you don’t need a
chainguide or bash protection.

Shock Clearance
We’ve found that some newer shocks are being built with air chambers
that require a little more clearance, and we’ve provided that with the

Tires and Rotors
Depending on brand and
depth of knobs, most 650b tires up to 2.35″ will fit the Mojo HDR. We’ve
found that different tire manufacturers seem to use different
calibrations on their rulers, so it could be that there are some 2.35″
tires that don’t fit.

You can fit up to a 200mm diameter rear rotor.

Cable Routing
Cable routing is provided for cable actuated adjustable seatposts.
Cable guides are all removable so you can have the cleanest possible
look depending on your cable orientation and whether or not you’re
running a front derailleur.

Polycarbonate Cable Guide
If you are an extremely aggressive rider, we’ve found that it’s
possible to damage the brake line and derailleur housing that will be
routed under the down tube. To prevent that from happening, we have
available an optional polycarbonate cable guard that bolts on under the
down tube.

Robust Lower Link
We expect the HDR to get an extra heaping helping of abuse, so we’ve
beefed up the lower link considerably, compared to the SL-R. It features
dual row angular contact bearings in the front of the lower link that
have less play than standard sealed bearings. The large 28mm x 15mm x
7mm radial bearings in the rear offer greater stiffness and longer wear.


The HDR 650b Story
Mojo HDR has been jiggling around in our heads for the last 18 months
or so. With the success of the Mojo SL-R, we wanted to incorporate some
improvements in molding technology that we’ve been utilizing on the SL-R
(lighter stronger stiffer). We also wanted to improve clearances for
current componentry (front derailleurs, rear shocks and 11 speeds), and
we’ve been scratching our heads on ways to add ISCG tabs.

the same time, we noticed there was a lot of enthusiasm for 650b wheels
from our customers, with many of them running 650b on the Mojo HD. That
wasn’t a passing phenomenon either, the forums are positively lit up
with 650b banter. We tried it first about a year ago on a converted HD
140. Everybody at Ibis liked it, so we studied our options. We all felt
the BB was too high, and mud clearance was pretty close to non existant.
We knew we were close to having a great new bike. We put all the
dimensions into the cad model and we knew right away we could get there
with minimal changes to the proven HD platform.

Then we set out on
the path to make the HDR, with proper clearance and BB height, along
with the changes mentioned above (molding, clearances, etc).

other part of the story is that the HDR in 160mm mode maintains geometry
identical to the good old HD, which has been our most popular selling
bike over the last couple of years. You are welcome to run the HDR 160mm
setup with 650b wheels. You just need to have Fox put in a travel
limiter on the shock (otherwise the tire will rub the seat tube),
reducing it to 145mm-150mm of rear wheel travel, depening on how large a
tire you want to clear.
That’s how the HDR came to be. 

Bike designers know that bikes with lower bottom brackets ride better,
due to the lower center of gravity. One thing that we’ve figured out
recently is that the 5″ change in center of gravity allowed by dropper
posts makes a .5″-.8″ change in BB height much less significant.

think that’s why adapting 650 wheels into bikes designed for 26″ wheels
are so popular, despite the raise in bottom bracket height. Five years
ago, before everyone had a dropper, we think the popularity would not
have been there, as the bikes would have been too tall.

What to call this wheel size?
a not very well kept secret that the whole world is going bonkers over
wheel size. Wars are erupting on the internet over wheel size, and now,
even within the subset of specific wheel size, wars are brewing over
what to call the wheel size. We can make a case for calling this
new (old) wheel size 650b, since that’s what it’s been called since
before any of us were born. And there’s history, those cigarette
smoking, wine swilling Frenchies from Velo Cross Club Parisien were
riding 650b bikes off road since the ’50’s.

And as all
of us who has ever seen Fox News know, nothing will incite a riot faster
than giving the French credit for something (especially if they earned
it). We can make the case for calling it 27.5″, since we’re pretty
set on the other sizes being called 29″ and 26″. The fact that it
doesn’t really measure 27.5″ doesn’t seem to be a big deal to people
advocating this size.

Our friend Chipps (Brit editor of Bike Radar) recommended that it be called “medium”. After all, we’ve got small (26″) and large (29″) already.  We were thinking of calling it “Taint”. Since it ‘Taint 26″ and it ‘Taint 29″. We
at Ibis prefer to stay like Switzerland in this, happily neutral, not
going to battle but preferring to stay on the sidelines, cut the cheese
(so to speak) and open wine bottles with our Swiss Army Knives. So we’ll just call it 650b sometimes and 27.5″ sometimes (in the interest of world peace).

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