The number of times I ever wanted a drag brake is ZERO. LOL. My SA XL-RD5w has done 46 mph. I'll slam on the brakes at any speed, NO worries.
It was actually TOO good, my first fork snapped clear across like a lazer hit it, above a brazeon and 2 more times at the same spot.
My last roadster came with a Nexus 7i and that 100% STUPID boat anchor roller brake. And yes their own manual says they heat up like a firecracker in 2 seconds. Don't touch for 30 minutes. Cooling fins?? Hilarious. NO LBS will ever stock that high heat grease either.
>> My SA drum brake wouldn't get one fingertip dirty in thousands of miles. Dirt just gets ground up and shed out I guess.
I give the pads and drum a wipe with 180 sandpaper and a dab grease on the cam. Done.
And actually rollers are HEAVIER than my SA XL dyno drum brake. Both the front and rear wheels. LOL. How's that for GARBAGE technology from none other than Shimano???
One hill on a tour bike and they would be on fire. LOL. I can feel them grinding. Actually they are more like an external COASTER greased brake.