?EASY INSTALLATION?Just unbolt your old seat and remove your seat post then bolt on your seat to your new seat post and install it into your bike frame. ?SAFE LINE MARK?There is a safe line mark on the seat post. Please insert at least above the minimum safety line. ?USE&FIT?Length:350mm;Diameter:25.4mm 27.2mm 28.6mm 30.4mm 30.8mm 31.6mm;Thickness of the tube:3mm.Seatpost used for for most old style bike,and the bike saddle with clamp. ?RELAX RIDING?Made of Polished Aluminum Alloy,light weight,strong and durable,Stable and not easy to break. ?IMPORTANT NOTE?Please do measure the actual required diameter before purchg. (Saddle clamp is not included, please buy the saddle clamp separately if needed).

Bike Type: Mountain Bike. Brand: Thinvik. Material: Aluminum. Color: 27.2*350mm. Date First Available: October 19, 2020. Best Sellers Rank: #57,715 in Sports & Outdoors. Customer Reviews: 4.4 out of 5 stars 76 ratings 4.4 out of 5 stars. : B09D3MZY4F. Size: ?27.2*350mmSilver. Part Number: ?Tv-SeatPosts-SL02-210819. Manufacturer: ?Thinvik. Material: ?Aluminum. Color: ?27.2*350mm. Brand Name: ?Thinvik. Package Weight: ?0.22 Kilograms. Item Package Dimensions L x W x H: ?14.37 x 1.46 x 1.02 inches.