Tire retaining feature for a bicycle rim

A wheel for a bicycle, the wheel comprising:

• a central hub configured for rotational attachment to the bicycle;
• a plurality of spokes attached to the central hub and extending radially outward from the hub, the plurality of spokes consisting of a number of spokes;
• and
• a rim comprising:
• a radially outer tire engaging portion having a first tire retaining portion and a second tire retaining portion spaced apart from the first tire retaining portion, wherein the first tire retaining portion includes a first tire retaining wall, and the second tire retaining portion includes a second tire retaining wall opposite the first tire retaining wall;
• a first sidewall, the first tire retaining portion extending from the first sidewall;
• a second sidewall spaced apart from the first sidewall, the second tire retaining portion extending from the second sidewall, the first sidewall and the second sidewall extending radially inward of the radially outer tire engaging portion;
• a radially inner portion disposed along an inner circumference of the rim, the plurality of spokes being attached to the radially inner portion of the rim, the first sidewall and the second sidewall extending radially outward from the radially inner portion;
• a first tire retaining feature attached to a first surface of the rim, the first surface being a surface of the first tire retaining wall;
• and
• a second tire retaining feature attached to a second surface of the rim, the second surface being a surface of the second tire retaining wall and facing the first surface, the first tire retaining feature and the second tire retaining feature being protrusions that entirely face each other and bulge out from a surrounding or adjacent surface,
• wherein the first tire retaining feature and the second tire retaining feature are made of a first material, and the first tire retaining wall and the second tire retaining wall are made of a second material.

A rim comprising:

• a radially inner portion disposed along an inner circumference of the rim;
• a first sidewall;
• a second sidewall spaced apart from the first sidewall, wherein the first sidewall and the second sidewall extend radially outward from the radially inner portion;
• and
• a radially outer tire engaging portion disposed along an outer circumference of the rim and having a first tire retaining portion and a second tire retaining portion spaced apart from the first tire retaining portion, the first tire retaining portion extending from the first sidewall and the second tire retaining portion extending from the second sidewall, wherein the first tire retaining portion includes a first tire retaining wall, and the second tire retaining portion includes a second tire retaining wall opposite the first tire retaining wall;
• a first tire retaining feature attached to a portion of a surface of the first tire retaining wall;
• and
• a second tire retaining feature attached to a portion of a surface of the second tire retaining wall, the first tire retaining feature and the second tire retaining feature being protrusions that entirely face each other and bulge out from a surrounding or adjacent surface, and the surface of the second tire retaining wall facing the surface of the first tire retaining wall.