Glossary

 

Database abbreviations & definitions (below diagram)

Lg – length
Ht – height
cc – center to center
ct – center to top
e – effective or virtual
TBF Spec Cat – see Using the Databases page under “About TBF”

All measurements in database are in millimeters (mm) unless stated otherwise.
(A) Top Tube Lg – horizontal distance between the centerlines of the seat tube and headtube measured along centerline of the top tube.
(R) Top Tube Lg e – horizontal distance between the centerline of the seat tube and the head tube if the frame were not sloping (or compact).
(B) Seat Tube Lg cc – distance along the centerline of the seat tube from the center of the bottom bracket to the centerline of the top tube.
(S) Seat Tube Lg cc e – distance along the centerline of the seat tube from the center of the bottom bracket to the centerline of the top tube if the frame were not sloping (or compact).
(C) Seat Tube Lg ct – distance along the centerline of the seat tube from the center of the bottom bracket to the top of the top tube.
(T) Seat Tube Lg ct e – distance along the centerline of the seat tube from the center of the bottom bracket to the top of the top tube if the frame were not sloping (or compact).
(D) Seat Tube Lg Total – distance along the centerline of the seat tube from the center of the bottom bracket to the top of the seat tube. Usually applicable to frames with integrated seat post.
(E) Seat Tube Angle – angle in degrees between horizontal and the centerline of seat tube.
(F) Setback – horizontal distance between the vertical centerline of the bottom bracket and the vertical centerline of the intersection of the centerlines of the top tube and the seat tube.
(U) Setback e – horizontal distance between the vertical centerline of the bottom bracket and the vertical centerline of the intersection of the centerlines of the top tube and the seat tube if the frame were not sloping (or compact).
(G) Head Tube Lg – length of the head tube.
(H) Head Tube Angle – angle in degrees between horizontal and the centerline of the head tube.
(I) Fork Trail (shown on separate image) – distance between vertical centerline of front dropout and the centerline of the head tube where each intersect the ground.
(J) Fork Lg – distance between top of the fork crown to center of front dropout along the centerline of the head tube.
(K) Fork Rake (or offset) – distance between the centerline of the head tube and a parallel line intersecting the center of the front dropout.
(L) Chainstay Lg – distance between the center of the bottom bracket and the center of the rear dropout.
(M) Front Center – distance between the center of the bottom bracket and the center of the front dropout.
(N) Wheelbase – horizontal distance between the center of the front and rear dropouts.
(O) Bottom Bracket Ht – vertical distance between the center of the bottom bracket and the ground (usually assuming 700 wheels and tires).
(P) Bottom Bracket Drop – vertical distance between the the center of the bottom bracket and the horizontal centerline of the front or rear dropouts (assuming wheels of equal size).
(Q) Standover Ht – vertical distance between the top edge of the top tube and the ground.