Seat tube (inside diameter): 27.0mm (accepts a 27.0mm seatpost).
Heat tube size: 1" diameter (for 1" headsets and forks).
Finish: ball-burnished to a high polish.
#HARO BICYCLE LG 21.5 MONOTRAC FRAME DESIGN SERIAL NUMBERS#
All of these known XL frames have low serial numbers (below HM009) and 1-1/8" head tubes.
#HARO BICYCLE LG 21.5 MONOTRAC FRAME DESIGN PRO#
According to Pro street SS, four 1994 Haro Monocoque XL frames have resurfaced in recent years.
Haro also had several XL sized frame made with 21" top tube - the XL frames appear to be more common today.
Internal 'ports' inside head tube and bottom bracket shell to reduce weight and to aid in cooling during welding.
An integral cable guide on the seat stays, behind the seat mast.
Cantilever posts mounted on top of the seat stays.
Sequential hand-stamped serial numbers on bottom of each frame's bottom bracket shell (HM#).
Two integral cable guides on the front triangle.
Heat-treated to T6 hardness after welding.
Water-jacket welded - aluminum cooled down with water as weld beads were applied.
Monocoque front triangle design - two stamped pieces of aluminum welded in the center.
Pro street SS believes that Haro made the concept frame overseas in order to "try out the design without pumping heaps of money into it and get a feel from the public and create some hype before production with Kastan".
This frame was made overseas (likely in Taiwan) - Info from BMX Museum member Pro street SS.
The original concept frame debuted in the 1993 Haro BMX Catalog (p.
Suggested for 12 to 16 year old racers - the frame having a 19" top tube.
Extremely stiff - especially out of the gate.
One of the most expensive production BMX frames in 1994.
Available for purchase by July 1993 (maybe earlier?).
Produced in limited quantities - only one batch of 300 frames were made ( Source: BMX Plus! Magazine, October 1996, p.
The first BMX frame to utilize monocoque construction.
Inspired by the Mantis "Flying V" mountain bike.
Designed by Dean Bradley (Haro) and Richard Cunningham (a design consultant who had experience in monocoque design for other bicycle companies).
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