According to Kelly Blue Book, a 2018 base RT1250 is worth $12,350 trade-in.
https://www.kbb.com/motorcycles/bmw/r-1200-rt-base/2018/?pricetype=trade-in.
A radio adds $100 to that value.
https://www.kbb.com/motorcycles/bmw/r-1200-rt-base/2018/?pricetype=trade-in.
A radio adds $100 to that value.