Big Plastic Pulley Wheel with Bearing Idler Pulley Gear Perlin Wheels 5mm Bore for 3D Printer, Large Model, CNC Router Hybrid CR-10, D-Type, I3(5 pcs)

The bearings move well, but these "big" pulley wheels are actually SMALLER that the original wheels of the (my) CR-10S as well as my Tevo Tarantula! Why are they called "big" when they are smaller than standard, original pulley wheels?

They roll.

You'll need a surface grinder to make these wheels fit . Should measure .400 thick or wide or whatever word you like to use . Actual size is .430 thick making the wheel .015 thicker per side . Measure before purchase checking for clearance . Not worth returning .

Bricolage