Specialized has been testing their
unique 1 x 6 gearing for many months now, although the Val Di Sole World Cup is the first time that it has been raced at the top level of the sport. What makes this setup truly interesting is the
very special 9 tooth small cog and prototype freehub body from DT Swiss that allows it to be used.
Inside you can see photos of the works gearing and read all the details directly from the man behind the scene! *Edit - Updated with a photo of a prototype SRAM PowerDome cassette using a 9 tooth cogRead on...A Closer Look At Team Monster Energy - Specialized's 1 x 6 GearingAlthough we've known about the Team Monster Energy - Specialized team's unique gearing for some time now, the more keen eyed of you out there may have
spotted it on the back of Curtis Keene's 2011 Demo that we featured months ago, just recently has Specialized taken the wraps off of the system, partly due to some overeager journalists letting the cat out of the bag a bit early! It should be noted that the gearing that you are reading about is still a work in progress and expect it to be more polished when you see it next. Don't ever believe anyone that tells you that racing doesn't improve the breed!
1 x 6 gearing as found on a Team Monster Energy - Specialized bike. Using a smaller chainring combined with a 9 tooth cog keeps the high and low ratios similar to a standard cassette, but with more clearance, better chainline, and the possibility of less weight. Is it a win - win?
The arrangement consists of six cogs that have been spaced out correctly as on a standard cassette. The Monster Energy - Specialized team's gearing looks to use separate cogs for the larger ones that would allow them to fine tune the gearing for the course or conditions, although that must also be a byproduct of them building the gearing from scratch as well. Their spread uses a 17 tooth large cog on the low end and a tiny 9 tooth cog for the highest gear. This is where the ingenuity comes in, because as anyone who's had their cassette off may well know, the smallest cog that would previously fit would be an 11 tooth version due to the freehub's diameter. This is where the team's wheel supplier, DT Swiss, steps in with a custom made freehub body that accepts a smaller cog. As of right now the actual design of the freehub remains unknown, but to get an idea of what it
may look like, have a gander at Shimano's commuter intended Capreo group that also uses a 9 tooth small cog. I'm betting that the DT Swiss freehub is also stepped and that the bottom few cogs used on the team bikes are a single unit. The 9-17 tooth spread is combined with a smaller 30-32 tooth chainring (
and a modified e.13 guide) that delivers similar gearing to a 11-21 road cassette and 36 tooth ring. By looking at the gear comparison below you can see that both standard gearing and this new 'compact' system have similar high and low ranges, but a 9-17 tooth block would have much different jumps between gears.
Gear development comparison*
• 30 tooth ring x 9 tooth cog = 7.183m
• 30 tooth ring x 17 tooth cog = 3.803m
• 36 tooth ring x 11 tooth cog = 7.053m
• 36 tooth ring x 21 tooth cog = 3.694m
*Gear development (also known as rollout) is the distance traveled by the bicycle per one revolution of the crank
Team riders always race with the 21 tooth cog locked out.
A modified e.13 guide covers up a smaller than average chainring that gives the rider more clearance and in turn, more room for error
There are certainly obvious benefits to this modified gearing arrangement, one of the biggest and most obvious being improved ground clearance. As you can see in the picture of Brendan’s bike below, today's bikes that use low and even lower bottom brackets shrink the room for error when traveling fast over rough terrain. There are certainly lines on many tracks that test a bike's clearance, especially when that rider is brave! Not only can that cause a race ending mechanical, but the bike also looses momentum every time its guard makes contact with the ground. Every advantage counts at this level and this advantage adds up to about 1/2" over a standard sized ring and guard.
But clearance is only half the story. Specialized's own Jason Chamberlain fills us in on the rest:
"The gearing itself is the other half. The range of gears required for a DH course is not very wide. Road cassettes are really the only option, but that gives you 9 cogs with 1 tooth steps. With only 6 or 7 cogs, you don’t have to shift as frequently on a given course as 9 cogs. The theory is that you have the same range of gears, but bigger steps between them. This means you will shift LESS on a given course. This saves time, energy and preserves mental focus. Every time you shift, you lose time. Every time you shift, you risk a mis-shift (just ask Andy Shleck). And with World Championships being won by 0.05 seconds, riders will take every advantage we can provide. Many guys have trained themselves to “double shift” every time they shift. The Monster guys actually had to retrain themselves NOT to double shift."This is a perfect example of the highest levels of our sport pushing for better equipment that makes more sense for the gifted riders that are using it. While you or I don't have a lot on common with Brendan Fairclough or how he rides a bike, we can certainly benefit from more reliable parts that are less likely to fail when we do mess up. I can also see the ability to run a 9 tooth cog on a wider spread cassette, picture a 9-36 tooth 10 speed block, working well on trail bikes when combined with a single ring between that ranges from 27-34 teeth. Expect more progression in the gearing department for consumers soon, but below Chamberlain lets us know what had to happen for the Monster Energy - Specialized team's gearing to see the light of day:
"For the concept to work, we needed multiple vendors to all come together on the same page. DT is making the hub. The cassettes were built from existing parts, or prototyped by SRAM. The rest was developed and built by Specialized. We modified some E.13 parts to work with the smaller rings and we have Gamut guides too." You're looking at a SRAM PowerDome cassette with a 9 tooth small cog. This is early prototype has been machined as a 9 speed unit, but expect to see 10 speeds soon. Welcome to the future.
Brendan's Specialized Demo after a single run that ended badly. Would half an inch made the difference? It certainly wouldn't have hurt matters...
I'll be attending the 2011 Specialized launch at Whistler in the coming weeks where they plan to release more information and photos of the new gearing system. There are also whisperings of a XC cassette in the works that incorporates that small 9 tooth cog - Stay tuned!
reducing the smallest cog on the cassette from 11T to 9T on the rear means reduced chain wrap (engagement between chain and cog)
this creates much higher torque loading on each tooth (900 nm per tooth!!) and on the chain rollers, causing accelerated wear and tear to the drivetrain = shorter running life and more maintenance issues
microdrive setups for BMX make sense as BMX are singlespeed and are not ridden in filthy, muddy wet conditions whilst changing gear, and are not ridden the same distances as mountain bikes (even DH race bikes are used over huge distances compared to bmx)
I stopped using 9T microdrive on my BMX because I was riding too much distance over the city and regularly wearing out the rear cog, chaindisc and chain - I switched to a larger (11t) setup and got massively increased durability
George French of G-Sport (odyssey) bmx fame wrote a very interesting article about the downsides of microdrive for bmx use a while back
www.gsportbmx.com/2003/06/super-small-gearing
And there was SRAM boasting about Minaar, Fairclough and Hill all doing so well at Maribor on the 10 speed kit. www.southerndownhill.com/images/stuff/sram-xo.jpg Seems a bit odd that both loads of gears and hardly any gears is the best way forward.
WIN all over it !
if anything i think it makes sense for a small 6 speed for dh.
I would love to have a 9 tooth on my AM bike (but does a 9T work on all bikes?), combine that with a 36t out back and then 1x9 would be even better.
As for DH I have been thinking about this for ages as it would allow people to use the Hope Trails rear hub which has more engagements than the standard ProII and is made for 6 speed.
Now a 9-36 on a hope trials rear hub......
Not sure if the trails rear hub allows for a completely dishless wheel to?
Out here we deal with fallen timber and maples seem to drop a lot more than what I saw out there on the west coast (it might just be that the trails were better maintained where I rode). I hate that anything smacking lightly against my derailleur seems to knock it out of place and I won't even mention the drops off of skinnies gone wrong. It's bad enough that we all go through multiple hangers every year. I don't like such precision that it's gets hyper sensitive.
I'm running an x-9 dearilleur with x-0 shifters so it's not my gear, and it always starts nice so it's not my tuning.
I keep on waiting for that highly efficient internal rear hub that only runs five or six gears and doesn't weigh a million grams, but that's a dream evidently. I wonder if you added that to a hammerschmit that ran a belt drive. . .
That would be a dream come true!
increased distance per crank rotation, more ground clearance, simplistic shifting, reduced weight
-- with ground clearance it is obvious that this would be during coasting. Sorted. Most people don't have the steelies to keep pedalling anyway... Reduced options during shifting means a faster reaction based on terrain. This is DH "Racing" for a reason; we really don't need the larger teeth options out back... as for reduced weight; not much unsprung weight lost in my opinion so I'm unconcerned
Does anyone know of where you can get a 30 tooth chainring? As far as I knew the smallest 104MM BCD chainring you could get was 32 teeth. Is that a modified crank they're running?
I didn't know you could get a 30 tooth cog for a MTB 4 bolt 104MM BCD crank.
Where would I find one?
Thanks,
Sucks for him, this was his year too! Oh yeah, this gearing stuff is cool for dh
for a factory team rider its all good..
for a privateer racer or recreational rider - not so good
people comment "you won't use the 9T often, so it won't wear?"
unfortunately, the reduction in front chainring size means you will be using the 9T rear cog much more often, and wear / tear from reduced chainwrap and increase torque loads on each tooth/cog and chain roller mean much-more frequent drivetrain replacement
www.shimano-benelux.com/publish/content/global_cycle/en/nl/index/products/city___comfort_bike/capreo/product.-code-CS-HG70-S.-type-.html
www.pinkbike.com/photo/4343689
Why is everyone hating on this like its a marketing scheme? its the first thing drivetrain related i've heard about in a while that actually makes sense. The entire drivetrain becomes more compact, out of the way, stronger and lighter. Whats to complain about there? bmx already made the jump to 9t compact drive 6 years ago.
10spd cassette on a dh bike, now thats a marketing joke.
factory mtn cycle
lp1.pinkbike.com/photo/4614/pbpic4614402.jpg
lp1.pinkbike.com/p4pb4717532/p4pb4717532.jpg
Personally I would prefer a Saint derailleur, but these guys are sponsored by Sram.
I did it better
but i think crash replacement is like 40-50% off
Getting rid of about 400g front mech is a nice thing with 30t chain ring I can crank it up with 34t casette, but then I can't pedal fast on asphalt and on downhills. 38t up front is ok for going horizontal and down but I can't uphill or do XC on it.