Rinno's Purple D2 Conical Wheels: A 50D Wheel That Promises Grip and Slip

• Model: D2, purple colorway
• Hardness: 50D
• Size: 8 x 5 mm (the title rounds it to 8mm)
• Shape: conical
• Material: pure urethane compound, described as a "hard wheel formula"
• Finish: glossy
• Recommended surfaces: smooth surfaces and concrete
• Made: handmade in California, USA
• Price: 35 at Caramel Fingerboards (the feed doesn't state the currency)
• Variants: none listed beyond this one

Hardness

50D is the number to anchor on. The listing frames it as the grip-and-slip middle ground, and in the same breath calls the urethane a "hard wheel formula." Those two descriptions can both be true, but they tell you the D2 leans toward slide rather than stick. Expect it to be at home on waxed ledges and concrete, which is what the listing recommends.

Shape and size

Conical, 8 mm, 5 mm wide. A conical profile is generally chosen to keep the board planted on transition and to clear the coping on grinds, but Rinno's listing doesn't publish a profile drawing or contact-patch width, so how aggressive the cone is on the D2 isn't something you can read off this page.

Urethane and finish

The pitch is that pure urethane gets you "as close as possible to riding with actual skateboard wheels." That's a feel claim, and feel is the one thing a spec sheet can't prove. The glossy finish is worth noting: a fresh glossy wheel can ride slicker than it will after a few sessions of wear on rough concrete.

What's missing

The listing doesn't say whether the D2 is a bearing or non-bearing wheel, doesn't name a bearing size if there is one, and doesn't describe the core. For a 35 set of wheels, those are the questions that decide whether it fits your trucks and how it rolls, and the page leaves them open.

Nothing yet, as far as the material in front of us goes. There are no rider reports on the purple D2 in hand at the time of writing, so there's no community verdict on how the 50D formula holds up on wood versus concrete, how fast the glossy finish breaks in, or whether the conical shape suits street or ramp setups better.

If you've been riding a set, that's the report other buyers need: surface, wax or no wax, and how it slides after a week.

On paper, the D2 is a sensible pick for a rider whose sessions are mostly smooth wood, waxed ledges and concrete, and who wants slides that carry rather than a wheel that bites. Handmade pure urethane, a conical profile and a 50D formula are a coherent package for that.

The caveat is the gap in the listing. Until you know whether it's bearing or non-bearing and that it fits your trucks, 35 is a blind spend. Ask first. If you mostly ride rough or grippy painted surfaces and want stick over slide, a self-described hard formula probably isn't where to start.

The D2 is on Caramel Fingerboards' product page.