Specifications

* Please note that many manufacturers specify maximum speeds based on approx. 20% overspeed conditions rather than disclosing the actual bearing speed limits or balancing quality which would result in much lower allowed maximum speeds. Our SKF 60TF bearings are the fastest option available for a 60mm shaft diameter, offering the highest performance on the market and the roller with full assembly (roller, flange, pulley) maintain an imbalance between 0.5g and 2g, averaging 1.2g – well below the 2.5g target and approaching 1.0g for superior precision and performance. When comparing specifications online, it’s important to be cautious, as such comparisons can often be misleading. To ensure an accurate comparison, always check which bearings are used and verify whether the stated maximum speed aligns with bearing specifications by calculating the roller’s RPM based on its diameter to ensure that manufacturer is not claiming higher speed than allowed. Our maximum allowed speed is determined by the safe bearing’s operational limit, ensuring reliability and longevity. Balancing quality would allow speeds of at least 2x faster than the bearing could handle.

** Please note that many manufacturers specify measurement errors as low as 0.1%, but this is unacceptable due to the limitations of chassis dynamometers. Reputable manufacturers acknowledge errors of up to 2%. Our rollers are crafted with the same precision as engine crankshafts, achieving a diameter accuracy of ±0.005mm (5 microns), resulting in a speed error of just 0.0125%. Additionally, our advanced electronics ensure roller speed accuracy within 0.003%. However, real-world factors like tyre deformation often introduce errors that are greater than the inherent accuracy of the machine itself. In practice, after 1,000 measurements, the observed error is around 1.5%, which is typical for an extremely accurate system. Be cautious when comparing accuracy online, as many sellers may present misleading figures. For even more precise results an engine dynamometer in a controlled lab setup would be preferable as it eliminates variables, as the engine is directly connected to the dynamometer, bypassing tyres and gearboxes. 

*** The maximum power an engine can measure on a chassis dynamometer is limited by the grip of the tyres, as long as the dynamometer has sufficient inertia and braking power – both of which our dynamometer provides. With our high – grip, anti-slip rollers, we can measure up to 2,000hp even in inertial mode. To measure more than 2,000hp, adding a brake could increase the capacity by 500hp per retarder. However, this increase is only possible until tyre slip occurs. This is why the maximum measurable power remains the same for each model, regardless of the number of retarders it has. For higher power levels, an engine dynamometer is the proper choice, as it eliminates the variables of tyres and gearboxes.