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1990 Cannondale SM600/700 Headset and Bottom Bracket

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1990 Cannondale SM600/700 Headset and Bottom Bracket

Old 06-19-21, 05:08 PM
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DcbChicago
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1990 Cannondale SM600/700 Headset and Bottom Bracket

I recently refinished a 1990 Cannondale SM600 or SM700 frame (not 100% sure the original model as it was repainted from its original colors), and am looking to build it up. The original catalog lists the headset as a "Tange Seiki double locknut, triple sealed" and it measures 30 / 31mm in diameter. The bottom bracket is listed as a "Shimano, sealed mech, bolt axle" - threaded and approx. 33mm in diameter.

I'm a bit lost on what headset and bottom bracket would be compatible with this frame.

Appreciate any help!
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Old 06-19-21, 09:41 PM
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KCT1986
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Just built a '90 M700 frame that came with headset and BB that needed changing. The HS seems to be similar to a Tange Passage w/double locknut. Standard 1" threaded with 26.4 crown on the matching original Ritchey fork. Installed a Tange Levin CDS 1", 26.4.

Original BB was a Shimano 122mm cup and cone. Installed a Shimano 68mm shell width BB-UN55 to match the crank to be installed.

Nothing strange on this frame. Everything pretty much standard for the time period. My rear OLD was135mm, seatpost 27.2.
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Old 06-22-21, 11:14 AM
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DcbChicago
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Originally Posted by KCT1986 View Post
Just built a '90 M700 frame that came with headset and BB that needed changing. The HS seems to be similar to a Tange Passage w/double locknut. Standard 1" threaded with 26.4 crown on the matching original Ritchey fork. Installed a Tange Levin CDS 1", 26.4.

Original BB was a Shimano 122mm cup and cone. Installed a Shimano 68mm shell width BB-UN55 to match the crank to be installed.

Nothing strange on this frame. Everything pretty much standard for the time period. My rear OLD was135mm, seatpost 27.2.
Thank you! - do you have a threadless headset that you would recommed for this frame? The Tange Levin CDS 1", 26.4 you recommend appears to be a threaded headset. Im trying to put a 1 1/8th headtube fork on this one if possible.
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Old 06-22-21, 12:34 PM
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KCT1986
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1 1/8" headtube forks doesn't really work with a 1" ISO or JIS headtube bore, (30.2mm or 30.00mm).

The 'pressed-in' part of most headsets that goes into the '1" frame' would have a inner diameter that is smaller that 1 1/8 (28.575mm). For a headset to fit in the frame and still accept a 1 1/8" steerer, it would need a 'pressed-in' portion that is micro-thin.

Additionally, the Cannondale's headtube is thicker in the middle since it has the top & bottom reamed out to the headset's OD. If you check your frame you'll probably see this 'step' in the top/bottom of the headtube. Didn't even try to see if a 1 1/8 steerer would go through my Dale frame when I had it apart.
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Old 06-22-21, 09:55 PM
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wesmamyke 
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The 1-1/8" fork in a 1" frame thing only works sometimes in older frames with american/bmx standard 1" head tubes.

The cups are almost 1-1/8" in size, and the head tubes tend to be straight, or close to it.
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