Why Are There Differences in OEM and Aftermarket Shock Lengths for the KTM Super Duke?

There are often massive inconsistencies when measuring shock lengths on the Super Duke platform. The KTM factory specification for the OEM rear shock is 356mm. However, it is not uncommon to pull an OEM shock and measure it at 359mm. That 3mm difference at the shock translates to roughly a 6mm difference in actual rear ride height. That is a crazy level of inconsistency straight from the factory.

This issue extends to aftermarket components as well. I have been suspicious for a while that the WP Apex Pro shocks that come stock on the RR models have different overall lengths compared to the aftermarket WP Apex Pro units. The manual states the aftermarket Apex Pro has a maximum length of 365mm (allowing for 7mm of adjustment). Yet, in the shop, we have seen units fully extended that measure much longer than the factory specs dictate. For comparison, most high-end aftermarket shocks—like Ohlins, Maxton, or MUPO—start at 360mm and offer 10mm of adjustment, maxing out at 370mm. Add in components like Superlinks, which increase rear height by about 18mm, and your geometry changes drastically.

When you start calculating swingarm length and anti-squat geometry, remember that swingarm length is supposed to be measured with the chain adjusted to the proper slack. However, chain stretch, differing chain lengths, and axle block positions introduce massive variables. You simply have to take raw shock measurements with a grain of salt.

This is exactly why a dedicated ride height tool is so valuable for chassis setup. No matter what shock length you are running, what your chain tension is, or what linkages you have installed, the only number that truly matters is your final, measurable ride height. Always remember: whenever you are establishing your baseline chassis geometry or measuring these components, the suspension must be hanging with absolutely zero weight on the tires for accuracy.