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Pinion conversion

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 · 08.06.2006

Pinion conversionPhoto: Daniel Simon
If you want to pedal lightly on the mountain, you need large sprockets. However, the standard sprockets fitted by manufacturers are only suitable for many amateur athletes on undulating terrain. Therefore: change your sprockets!

Campagnolo riders have it good, as the manufacturer offers them a cassette with a 29-tooth sprocket as standard. Shimano, on the other hand, only offers 27 teeth as the largest sprocket for road bikes - if you want more, you'll have to improvise. Sprocket specialist Marchisio offers individual sprocket discs for both Shimano and Campagnolo, which can be freely combined. Disadvantage: Individual sprockets dig into freewheel bodies made of the comparatively soft material aluminium. Not only do they leave ugly marks, they can also bite into the freehub body almost inseparably. If entire sprocket sets made of Marchisio sprockets are installed, the shifting function also suffers considerably in comparison to single-variety gearboxes. The tips of the sprocket teeth are only tapered and set at a slight angle; you will look in vain for shift points, as Shimano once introduced with the HG series for smooth gear changes. With individual Marchisio sprockets, Shimano's ten-speed drivetrains can nevertheless be made very
Shimano's ten-speed drivetrains are still very suitable for mountain riding.

Degree of difficulty: for experienced screwdrivers

You will need:

  • Tool: Chain whip, sprocket puller, grease, cloth

Shimano's ten-speed sprockets are 1.6 millimetres thick, the nine-speed sprockets are 1.8 millimetres thick, which is why they are not suitable for converting ten-speed cassettes, as the shifting behaviour is impaired by the different sprocket spacing. Nine-speed sprockets also do not fit on ten-speed freehub bodies made of aluminium because their toothing profile is higher. However, they do fit on ten-speed freehub bodies made of steel (e.g. Ultegra). But: Be aware of the clearance problem! Shimano also offers a 30 mm sprocket from the HG-70 series as a single part; however, it is also 1.8 millimetres wide and cannot be made compatible with Shimano's ten-speed spider rings due to the slightly recessed collar in the spider arm. We are not currently aware of any manufacturer of special spacers.

What goes with what?

SHIMANO ten-speed hub & gears

1. remove the old sprocket set, clean the freewheel and grease it lightly. Fit a 30 mm Marchisio sprocket from the ten-speed series for Shimano onto the freehub body. The asymmetrical profile determines the mounting direction.

SHIMANO nine-speed hub & ten-speed drivetrain

The sprocket body of the nine-speed hub is, even if it sounds strange, slightly wider than that of the ten-speed hub, which is why a special spacer ring is required on the spoke side for standard ten-speed sprockets, which Shimano supplies as standard with the wheel. The largest Marchisio sprocket is cranked differently and does not require this ring. Three spacer rings supplied must be inserted: a white plastic ring, a steel ring and the large blue plastic ring. The assembly is then carried out as described above.

SHIMANO nine-speed hub & derailleur

Remove the spider and fit the 30 mm Shimano sprocket together with an intermediate ring from the individual sprockets further out. Then fit the spider arm and the remaining sprockets with the exception of the 13 mm sprocket. Leave out the 13 mm sprocket and instead fit the 12 mm sprocket with the collar directly onto the sprocket body.

Checking the switching function

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