The Serpent 904222 - S990E belt tensioner shaft is a straightforward upgrade for racers and hobbyists who want consistent belt tension. Built for the S990E chassis, it helps prevent slack, lowers wear, and keeps the drivetrain delivering steady power.
Fit this part during routine servicing or when upgrading your vehicle's drivetrain. It is suited to drivers seeking predictable belt behaviour and lower long term maintenance.
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