RB8247 sunglasses use a round metal front on 145mm metal arms, slightly longer than the 140mm standard on most Ray-Ban lines. This aftermarket pair keeps that extended length and the round-curved profile, so it hinges into the front correctly rather than sitting a touch short the way a standard-length arm would. The prescription version, RX8247V, shares this same 145mm length and round shape, so the RB prefix is what confirms the sunglasses variant.

The extra 5mm on frames like the 8247 usually goes into the curve behind the ear rather than anywhere visible, which is easy to overlook when ordering — a 140mm arm can look almost right but sit noticeably looser. Checking the exact temple size before buying saves a return. If the old arm is available to measure, comparing it against a ruler is a quick way to confirm the 145mm figure before placing an order.

Frequently asked questions

What if the arms arrive and the hinge doesn't line up with my frame?

Because each pair is listed against a specific model, in this case the 8247, mismatches are rare, but you're covered by a 14-day return window if the 145mm arms don't align with your hinge.

Is it worth buying new arms instead of a whole new frame?

Replacing both arms on the 8247 costs from €26.95 with free worldwide shipping, far less than a new frame, and it's backed by a 3-year warranty against manufacturing defects on the 145mm hardware itself.

My hinge feels loose — will new arms fix that, or is it the frame that's worn?

A new 145mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 8247, replacing it usually restores a snug, tight fold.

What material are the arms made from, and will the color match my frame?

The arms are molded in an acetate or metal finish that matches the Round style of the 8247 closely, though very slight shade variation is possible since they're independently produced as separate aftermarket parts rather than cut from the same batch as the frame.