Bike Forums - View Single Post - Shimano ST-6400 & ST-1055 (600 Ultegra Tricolor & 105) hood compatibilty
Old 09-20-19, 09:48 PM
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Same question as in this thread.

Exploded st 6400 diagram. Shimano 600 Ultegra dual control lever

Exploded st 1055 diagram. Shimano 105sc dual control lever

From Shimano technical documents. The same documents have common part numbers for much of the internal components, but different part numbers for the brackets and bracket covers (lever bodies and hoods). These aren't the non aero brake levers, though that was how i found it after giving up for a year. Road guy suggested 105s are close enough, but I have to ask to confirm.
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