A conversion bicycle apparatus includes a chassis. The chassis includes a main tube. The chassis additionally includes a head tube. The chassis additionally includes a seat tube. The chassis additionally includes a rear fork. The rear fork includes a first fork arm and a second fork arm. The chassis additionally includes an attachment receiver. The attachment receiver is located proximate to a junction of at least the main tube and the rear fork. An attachment assembly is reversibly couplable to the attachment receiver via one or more protrusions and one or more corresponding apertures. The attachment assembly is additionally reversibly couplable to the attachment receiver via one or more fasteners.

The present invention relates to a 1. Chain casing for encasing of a chain spanning a main chain sprocket and a driven chain sprocket, such as comprising two free chain parts, a pulling chain part and a returning chain part, of preferably a vehicle, such as a bicycle comprising a frame, the chain casing comprising:a main chain sprocket cover element for covering of the chain at the main chain sprocket, such as a pedal spindle chain sprocket:a pulling chain part cover element for covering of at least a part of a pulling chain part between a main chain sprocket and the driven chain sprocket;a returning chain part cover element for covering of at least a returning chain part between the main chain sprocket and the driven chain sprocket;a chain tensioner cover element for covering of a chain tensioner assembly with the chain arranged therethrough. Furthermore, the present invention relates to a chain tensioner assembly, preferably fitting in the chain casing.

The present invention relates to a 1. Chain casing for encasing of a chain spanning a main chain sprocket and a driven chain sprocket, such as comprising two free chain parts, a pulling chain part and a returning chain part, of preferably a vehicle, such as a bicycle comprising a frame, the chain casing comprising:a main chain sprocket cover element for covering of the chain at the main chain sprocket, such as a pedal spindle chain sprocket:a pulling chain part cover element for covering of at least a part of a pulling chain part between a main chain sprocket and the driven chain sprocket;a returning chain part cover element for covering of at least a returning chain part between the main chain sprocket and the driven chain sprocket;a chain tensioner cover element for covering of a chain tensioner assembly with the chain arranged therethrough. Furthermore, the present invention relates to a chain tensioner assembly, preferably fitting in the chain casing.

A bicycle chain cover includes a rear casing, an outer cover connected with the rear casing, and an inner cover connected with the rear casing. The inner cover and the outer cover are opposite to each other. The inner cover has two first ribs, two second ribs, a first ring and a second ring. The two first ribs are disposed at an inner edge of the inner cover. The two second ribs are disposed at the inner edge of the inner cover. The first ring is connected to the two first ribs. The second ring is connected to the two second ribs. The second ring is rotatably disposed in the first ring.

A bicycle chain cover includes a rear casing, an outer cover connected with the rear casing, and an inner cover connected with the rear casing. The inner cover and the outer cover are opposite to each other. The inner cover has two first ribs, two second ribs, a first ring and a second ring. The two first ribs are disposed at an inner edge of the inner cover. The two second ribs are disposed at the inner edge of the inner cover. The first ring is connected to the two first ribs. The second ring is connected to the two second ribs. The second ring is rotatably disposed in the first ring.

A motor cycle protective accessory includes a skid plate with an extension arm. The skid plate is attached to a front of the derby cover and primary cover of a motorcycle. The skid plate forms a spacer between the derby cover and any surface on which the motorcycle is laid or dropped, thus taking the impact of any damage from the surface instead of the derby cover.

A motor cycle protective accessory includes a skid plate with an extension arm. The skid plate is attached to a front of the derby cover and primary cover of a motorcycle. The skid plate forms a spacer between the derby cover and any surface on which the motorcycle is laid or dropped, thus taking the impact of any damage from the surface instead of the derby cover.

A motor cycle protective accessory includes a skid plate with an extension arm. The skid plate is attached to a front of the derby cover and primary cover of a motorcycle. The skid plate forms a spacer between the derby cover and any surface on which the motorcycle is laid or dropped, thus taking the impact of any damage from the surface instead of the derby cover.

A motor cycle protective accessory includes a skid plate with an extension arm. The skid plate is attached to a front of the derby cover and primary cover of a motorcycle. The skid plate forms a spacer between the derby cover and any surface on which the motorcycle is laid or dropped, thus taking the impact of any damage from the surface instead of the derby cover.