THIS 4130 MACHINED HEAD TUBE IS MADE TO EXCEPT IS42 UPPER AND IS52 LOWER HEAD SET INTEGRATED BEARING. USING VARIOUS HEAD SETS TO WORK WITH 1-1/8 OR TAPERED 1-1/8 TO 1-1/2 STEER TUBE

120MM LENGTH +.5/-0

UPPER HEAD TUBE IS 45MM AT RACE , TUBE SECTION IS 42MM

LOWER HEAD TUBE IS 55MM AT RACE , TUBE SECTION IS 48MM AND TAPERS UP TO 42MM ON A 200MM RADIUS . END OF RADIUS IS 55MM FROM BOTTOM OF HEAD TUBE.

MAIN TUBE CENTER SECTION IS 1.5MM WALL THICKNESS

RACE ID ARE MACHINED FOR IS42 UPPER AND IS52 LOWER. HEAD SET WILL DROP IN PRE WELD/BRAZE . POST WELD/BRAZE BEST PRACTICE WILL BE TO REAM RACES FOR DISTORTION. USING ALUMINUM OR BRASS HEATSINK WILL GREATLY REDUCED DISTORTION AND REAMING.

120MM HEAD TUBE ESTIMATE WEIGHT 202 GRAMS

SKU - TBE-HT-42-52-R200T-120