With Suzuki building an all-new RM-Z450 last year, the 2019 Suzuki RM-Z450 receives new suspension settings this year.

We haven’t tested an RM-Z450 since 2012, so we were long overdue. From then until 2017 Suzuki made only incremental updates to the RM-Z450, and it had fallen behind the pack in many areas.

Last year, Suzuki gave the RM-Z450 an all-new chassis with new suspension. Although it didn’t get a new motor, the existing powerplant was heavily updated. The feature the RM-Z450 didn’t get that we wish it had was electric starting.
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https://ultimatemotorcycling.com/2019/02/01/2019-suzuki-rm-z450-review-affordable-racer/