Is this available for a 5/8 ROH?

Yes indeed, we have a smaller cylinder that is better for smaller radius roh skates like hockey skates. The normal cylinder will work fine as it will deform to fit but the smaller cylinder is better. We have a retro kit that converts the Skatemate for small radius skates. See www.skatemateuk.com for full details.

What is the "resting" ROH when no pressure is applied?

We generally ship with a half inch ROH cylinder. below is some info ref ROH The Radius of Blade Hollow Skate-blade sharpness is measured by the thickness of the round-edged grinding wheel used to make the hollow. Since blade thickness is almost universally about 1/8 inch, the radius of the rounded-edged wheel can be an accurate measurement for sharpness among all different skate manufacturers. This measurement is called the “blade hollow,” the “radius of hollow,” or the “grind hollow.” The radius of a standard hollow is usually a half inch. Since a grinding wheel with a larger radius etches out less of a hollow, it leaves the blade with less-pronounced edges, making it less “sharp.” Conversely, a wheel with a small radius increases the “sharpness” of the blade. While the standard radius of hollow is a half inch, the range that hockey players use is anywhere from 3/16 inch to two inches. The half-inch standard is likely what you will get if you drop your skates off at a pro shop without specifying how sharp you want them. This standard is also the most common radius of hollow among National Hockey League players. A half-inch radius — or sometimes 5/8 inch — works for the vast majority of hockey players. If you’re new to hockey, start with one of these measurements. We can supply a "retro kit" that has a cylinder with a smaller radius of 3/16th inch which is recommended for hockey skates. I hope that helps

Material Type	Aluminum
Number of Items	1
Sport	Ice Skating
Batteries Included?	No
Brand	Skate Mate
Manufacturer	SkateMate
Item model number	E50
Product Dimensions	0.71 x 0.28 x 0.25 cm; 49.9 g
ASIN	B00AMPOXDI

Patented Handheld Ice Sharpener/Conditioner For All , Hockey, Speed Or Dance! By

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