Can anyone tell me about these shimano 600 three arm cranks?
03-16-13, 11:58 PM
#1
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Can anyone tell me about these shimano 600 three arm cranks?
Unusual. Never seen them before. Does anyone know anything about them, their vintage etc?
03-17-13, 12:15 AM
#2
Bicycle Repair Man !!!
They were produced from 1975 until 1977 and were a little step up over Shimano's existing groups but still not of the caliber of the later 600 series parts.
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03-17-13, 07:23 AM
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They were the touring crank, Shimano's other alternatives had a BCD that would not allow the small rings this set did, but curiously, that aspect was rarely exploited at least in the USA market.
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03-17-13, 08:43 AM
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These cranks were actually introduced for the 1976 model year. The original 600 series was concieved primarily as a touring group to complement the Dura-Ace racing group. As such the cranks were designed for a 30T low gear. They have an odd, 95mm BCD. In 1978 Shimano decided to bring out a new version of 6oo, called 600EX, which was a less expensive version of Dura-Ace aimed at the mid-range sports/racing market. However, Shimano continued to offer the original, touring oriented 600 group and even expanded it, by offering a triple version of the crankset in question. The 600 touring group and 600EX sports/racing group would be produced concurrently into the early 1980s.
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