HAMMERSCHMIDT TRUVATIV PDF

It consists of a special right side drive crank containing internal planetary driven gears, a collar assembly plate, bottom bracket bearing, left crank, and shifter figure 1. The kit also includes spacers to exactly position the collar assembly plate. Figure 1. A conventional crank with chainring will turn together, with one rotation of the crank equal to one rotation of the chainring. In the fixed arm mode, with the inner ratcheting gear disengaged, the arm will turn with the ring as with conventional cranks. When the lever is released and the pawls engage the inner gear ratchet, the chainring will turn more than the crank.

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While the HammerSchmidt never enjoyed widespread rider acceptance in America, many European bike brands adopted the system. While mostly intentioned for gravity use, we saw the product used for various applications including singlespeeds hey, it doubled their gearing options. Not a common sight on the trail, the HammerSchmidt is still available and may find acceptance from unexpected sources Fat Bikes?

This was our first impression of the product in HammerSchmidt two-speed crankset on the Scott Ransom. We got the chance to ride the two-speed crankset during a media introduction in SLO, California.

The HammerSchmidt shifting is immediate and can be done while pedaling forward or reversed, stopped, or mid-air, should you please. The basic package is an inch-wide disc about five inches in diameter that houses a been around for a million years sun-and-planet gearbox.

Shifting is done with a revised SRAM left side trigger, however, the lever operated in reversed sequence? This is not to hard to get right, as there are only two choices and you are already in one of them. HammerSchmidt All-Mountain version is very compact. The single-ring is easily switched with a simple locking ring, without tools. Switch to second gear, and a clutch stops the sun gear, which forces the planets to overdrive the outer ring gear, At this point, a slight clicking will be heard from the freewheel pawls inside the HammerSchmidt gearbox as the outer ring overrides the inner one.

Anyone who has approached a technical climb in too-tall of a gear on a heavy all-mountain bike can attest to the fact that walking is the next option.

Not with Hammerschmidt? No fuss, no grinding. The same goes for topping a steep grade. You will, however, find moments when you will like a half step between them, but this whiner-esque subtlety is not the stuff of Hammerschmidt riders. The Sun and ring gears with the freewheeling ratchets exposed. Weight is a question when you are replacing aluminum sprockets with gears and bearings.

In the hand, the HammerSchmidt feels about a pound heavier than a bare two-chainring crank—but it eliminates a lot of complicated and weighty junk from the bike. HammerSchmidt mounts to an international-standard chainguide boss. HammerSchmidt requires an international standard chain guide ISCG boss on the frame it fits the latest two sizes to counteract the reverse torque when shifting to high gear.

The installation is simple and anyone should be able to take it apart and clean the gears should curiosity get the best of you. I did it in about a minute. A single derailleur cable under the bottom bracket area actuates the shift pawls and it is insensitive to adjustments or cable stretching. The shifting plate, bolted in place on the bike. HammerSchmidt is so compact that, even if it did not have its own chainguide and bash guard, it would rarely contact logs or boulders?

Certainly, the very touchy dw-Link designs will not tolerate such an arbitrary shift in the diameter of the chainring. Ahh, growing pains are part of meaningful change. What the HammerSchmidt is, however, is meaningful change. A close look at the built-in chain guide and bash plates.

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There are two gears: and Overdrive. In , everything is locked and spinning together. Turn the pedal once and the chainring goes around once. In Overdrive, the ratio is approximately Turn the pedal once and the chainring goes around about 1. The Truvativ HammerSchmidt transmission is a planetary gear design that when engaged and locked down gives you a chainring to pedal revolutions. When cable is released and the overdrive is engaged, you get 1.

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While the HammerSchmidt never enjoyed widespread rider acceptance in America, many European bike brands adopted the system. While mostly intentioned for gravity use, we saw the product used for various applications including singlespeeds hey, it doubled their gearing options. Not a common sight on the trail, the HammerSchmidt is still available and may find acceptance from unexpected sources Fat Bikes? This was our first impression of the product in HammerSchmidt two-speed crankset on the Scott Ransom. We got the chance to ride the two-speed crankset during a media introduction in SLO, California. The HammerSchmidt shifting is immediate and can be done while pedaling forward or reversed, stopped, or mid-air, should you please.

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