Truvativ HammerSchmidt Pro Review

Pro Reviews

(this article originally posted at and courtesy of

Truvativ HammerSchmit (AM)

It’s not every day that you get to ride something as unique as the Truvativ HammerSchmidt. What Truvativ has designed, a planetary gear system, is impressive to say the least.

What HammerSchmidt does on the surface is replace a double ring setup with a single ring one that offers the same gear range, but there are many more benefits to it. Read more inside.

While the idea isn’t new to the transmission world, it is impressive to see the idea implemented in a crankset to effectively replace not only the double ring setup, but also acts as a bashguard and a chainguide all in one. Before we delve into the details of the ride here is a run down of the two versions available for after market purchasing.

HammerSchmidt will come in two flavors, an AM and a FR Version.

All Mountain (AM)

  • Crank arm lengths are 170 and 175mm
  • Tungesten Grey finished arms made from AL 7050 TV
  • Versions for 68, 73, 83mm bottom bracket sizes
  • Gearing equivalent to a 22t/36t or 24t/38t
  • 15mm crank bolt
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  • Reginhild says:

    The concept might allow for what would be normally be a large front sprocket (without the size). A future combo that might be nice to see would be a new set of gear ratios to go with the Hammerschmidt. What if the Hammerschmidt did a 2.4x overdrive and went with a rear sprocket that had the following teeth – 15,16,18,20,22,24,26,30,34 ? It should allow you to shift up through all the gears on the rear sprocket and then switch to overdrive and shift up through the gears again providing continuous change of ratio.

  • Ralphy says:

    “The overall system weight of the HammerSchmidt will come down over time but currently it is a bit portly when compared to lighter setups.”

    So you’re saying the HammerSchmidt is heavier than a lighter setup?

  • J says:

    Yea, the HammerSchmidt is clearly not the lightest setup out there. Look at the numbers and compare them to other setups and you can see. Consumers have to think about the benefits and drawbacks to the HammerSchmidt system as a whole to determine if its right for them.

  • A says:

    how much is it in money

  • air says:

    Definitely not the type of crankset I want. Between Truvativ’s outstanding… err… alright… crappy bottom brackets to their crappy reliability with their crank sets, the company hasn’t given me any reason to spend 2x on a crankset compared to an opposing Shimano or even the B-Boxx by Bionicon/Nicolai.

  • james says:

    well, i heard that truvativs had a habit of dropping off but have been pleasently surprised; my stylos havetn fallen off yet in over a year of abuse.

  • jonas says:

    i wonder how it will work with a rohloff hub? (too bad the hammer doesn’t have twist shifting so the shifters match)

  • Jason says:

    The Hammerschmidt + Rohloff idea sounds good but it wouldn’t work as well as you think. The Rohloff needs a bigger (~32t) front chainring to give the correct gearing.

  • John says:

    The Rohloff already gives the same gearing range as a typical 3×9 setup, so the question is what would you do with the extra gearing range of the Hammerschmidt? If you plan to use it to set a speed record, then you only need the upper gears anyway. Just go with a huge chainring on a cpnventional 3×9 setup, or run a Rohloff with a huge chainring.

    If you go with a normally sized cog in the rear, as I do with mine, (a 16-tooth, I think), then running a 32-tooth chainring on the front with the Hammerschmidt would not only give a ridiculously, and unusably low ratio with the Hammerschmidt in low range, but would certainly over-torque the Rohloff beyond its design limits. Rohloff states that to avoid overloading the Speedhub the gearing ratio between chainring and the cog on the hub must be at least 2.35 to 1. If you are running a 16-tooth cog on the rear, for example, you would have to run at least a 38-tooth ring on the front, or the torque could damage the hub. So, with either the 22 or 24 tooth rings available for the Hammerschmidt, You would overlaod the Rohloff Speedhub, even with the largest available cog, (17 teeth). So, I can’treally see any good reason to couple a Speedhub with a Hammerschmidt.

    Incidentally, I’ve been running my Speedhub on my Santa Cruz Bullit on downhill and urban assault since 2001, with no problems. I’m on my third fork, second shock, and third rear rim, but the Rohloff has taken lots of abuse with no signs of wear. The only complaints I have are that it is heavy, and in certain gears, where you drive through all three planetary gearsets, the friction is noticeable.

    I imagine there will almost certainly be a bit of added friction in the Hammerschmidt, as well, although probably not very noticeable.

  • Paul says:

    Looks like a great front-end solution. Rear shifting is where it’s at, so when they introduce an alternative to the Rohloff hub, things will really get interesting.

  • Cracker69 says:

    Nice article, but didn’t you forget to subtract the weight of the front derailleur. This would mean around 160g less than quoted and make it pretty much a wash with the two-ring stylo.

  • Steve says:

    All those weight numbers are provided by Sram and looks to be included in the weight comparison part but not the savings table. So no it isn’t a wash.

  • Steve says:

    Also they include that Truvativ XR which is a tank (Stinger for example is a light/good two ring guide). Compare the numbers to a Shimano XT setup w/stinger and you’ll see that difference is quite a bit more. Hammerschmidt looks to offer some really nice benefits though as well that you have to take into consideration

  • Jordan says:

    Does anyone have any real world riding experience, instead of straight speculation?

  • somedude says:

    Good idea but poor execution. SInce rear cassettes already offer 1:3 ratio with 11:34 teeth on cogs the planetary front system should offer at least a 1:2 or ideally a 1:3 ratio. As is it there is the same wasteful overlap of ratios as found in classic derailleur based systems.

  • efd says:

    nice …Others may have other opinions but a light, capable “rear” geared hub would be more beneficial to me. Still, its great to see innovation and new products. I run a 2×9 now and would certainly consider this if not for the price, and the loss in efficiency

  • Hangdog98 says:

    The Rohloff doesn’t need a Hammerschmidt, it covers all the gears you need already. The Hammerschmidt is just a nicely packaged Schlumpf Crankset and the math has already been done to get a good gearing range with the Shimano Alfine 8sp internal hub. Check out Sheldon Brown’s gear calculator to work out your ratios. Nice job SRAM except for the obscure mounting requirements.

  • Pingback: Hammerschmidt « The Lazy Randonneur

  • TheRanch says:

    Most comments have missed one important point about this crank is and I quote here… “The Truvativ HammerSchmidt AM crankset could very well revolutionize bicycle drivetrains from this point forward by eliminating that last bastion of low-tech: the front derailleur. Gone are the days of jammed or dropped chains, missed shifts and bent cages in favor of a seamless and bulletproof system that magically ekes two gears out of a single chainring in any condition, under any load (or even no load), any time you wish.”

    I’m looking for a system that uses this crank OR I go with a chain guide & a 10spd cassette, 32t front ring, 10spd shifter, 10spd rear derailleur and 10spd width chain.

  • Joey says:

    Will the Hammerschmidt fit a Santa Cruz Butcher without any frame modification?

  • GZ says:

    Intense Tracer….been riding THSchmidt for over two years..never go back
    Still using the same chain…ground clearance..Zero maintenance..Bullet proof.

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