Ok research time Dr Pawsy bear wheel rim consultant!
819 mavic
Width: 23.5mm
Profile: 21mm
Hole: 32
weight 26": 475 grams
Recommended tire widths: 1.50 to 2.30
XT Shimano
Rim Height 21mm
Rim Width 23.3mm
Recommended Tire 26 x 1.50-2.25
So Dr Pawsy Bear concludes that:
1. There is no difference in rims, Mavic is 0.2mm wider which is technically a gnats kacker so doent count 😆
2. Only difference is Mavic = 32 spoke Shimano = 24 So guess there is a difference in rim design because spoke number is different?
We have therefore reached the limit of Dr Pawsy Bear knowledge envelope.