I did originally try attaching a 5kg/11lb barbell plate* ( the pro flywheel is 5.45kg/12lb ), but it caused a fair bit of vibration when riding. I can only speculate that this was due to the plate not being perfectly round?
*cheapskate
probably due to that and it not being perfectly centered - you would need to carefully "balance" the wheel to avoid that kind of vibration.
@danb started
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I did originally try attaching a 5kg/11lb barbell plate* ( the pro flywheel is 5.45kg/12lb ), but it caused a fair bit of vibration when riding. I can only speculate that this was due to the plate not being perfectly round?
*cheapskate