check on the legality of those tires for Optima Challenge. I think they require a treadwear of 100??? Might be different this year though.
I think drums will be lighter than discs in this case. We replaced 2nd gen discs with Baer 13" Track kit and saved 2 lbs.
The bar weight can be estimated from a steel chart having diameter and length.
Stock bar weighs 5 lbs.
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