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Any Insider to '80s DA Groupsets. need info re: 7500 or Pitch 10 Group

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Any Insider to '80s DA Groupsets. need info re: 7500 or Pitch 10 Group

Old 08-01-20, 02:09 PM
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Any Insider to '80s DA Groupsets. need info re: 7500 or Pitch 10 Group

(posted on SS&FG forum too, that i've never had a needed answer or at least humane responses, lol. strongly believe C&V has better odds)

trying to see if the crown race for HP7500 (headset for DA7500 groupset) is interchangeable with other DA groups. 7500 was a track specific, only sold in J for mostly Keirin. same headset was also a part of the famous DA 10 Pitch group. Velobase lists that it did come with ISO too.

found one, located in Taiwan but it's with JIS crown race. i need ISO, which is available nowhere. if it's interchangeable with other cup&cone models in Schimano realm, i might have a solution. if anyone has a link to spec sheet with part number,s that would be helpful too. i couldn't find any around 7500 set.

(i know i might be able to use a shim, just trying to see this first)

Last edited by orangeology; 08-01-20 at 04:22 PM.
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Old 08-01-20, 02:14 PM
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(btw, there are other options i'm looking at same time, too. this is also for learning some useful knowledge around the things)
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Old 08-01-20, 03:04 PM
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HP-7500 crown race, P/N 722 0600, no options.

This crown race P/N is the same as for the earlier UA-200 Dura-Ace track headset.

I'm not sure what you are trying to accomplish. You do realize that the track headsets are designed to be used with smaller ball bearings?
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Old 08-01-20, 04:05 PM
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Originally Posted by T-Mar
HP-7500 crown race, P/N 722 0600, no options.
This crown race P/N is the same as for the earlier UA-200 Dura-Ace track headset.
I'm not sure what you are trying to accomplish. You do realize that the track headsets are designed to be used with smaller ball bearings?
nothing less than expected. a perfect info, thank you very much, sir!
(and yes i was aware that those were with different bearings. wanted to see if any other model also shares the same base plate, as the ones around 7500 was very rare)

what i was trying to do was: to buy the 7500 headset—there's one available in TW, with 27.0mm CR—and alter the crown race from other models if interchangeable. clearly it's not gonna be easy unless i can source the UA-200. i've given up the idea almost by 98% now. the 7500 headset alone (NOS) costs $200 anyway. not sure it's worth the hassle.
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Old 08-01-20, 04:19 PM
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T-Mar quick question for you, sir.
HP7000 (1st gen DA) is identical to UA-200? i see the 1st gen DA dubbed as UA-100, but don't see any UA-200. however, i do remember having seen some 1st gen DA HSs with the small, 5/32" bearings. given production time & similarity of the parts i.e) top nut shape etc, i roughly guess they can be sharing same parts?
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Old 08-01-20, 07:14 PM
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Originally Posted by orangeology
T-Mar quick question for you, sir.

HP7000 (1st gen DA) is identical to UA-200? i see the 1st gen DA dubbed as UA-100, but don't see any UA-200. however, i do remember having seen some 1st gen DA HSs with the small, 5/32" bearings. given production time & similarity of the parts i.e) top nut shape etc, i roughly guess they can be sharing same parts?

The early model numerology can get quite tricky., which is why Shimano introduced a more standardized system in 1980.


The UA-100 was the 1st generation Dura-Ace headset but it was the road version. For 1979 Shimano introduced 2nd generation Dura-Ace EX but only in a road version. The Dura-Ace EX road headset was UA-110 being renamed HP-7200 for 1980 and being produced through 1984. It was also used on Dura-Ace AX, with the addition of a plastic cover.


The first generation Dura-Ace track headset was the UA-200. When Dura-Ace 10 was released in 1977 it didn't require a specific headset, so it continued to use the UA-200 until the 1980 renumbering, when it was designated HP-7500.


Here's the 1980s Dura-Ace numbering system:


70xx series - Dura-Ace 10 (track, 2nd generation)

71xx series - Dura-Ace (road, 1st generation)

72xx series Dura-Ace EX (road, 2nd generation, continued to be manufactured concurrently with 3rd generation)

73xx series Dura-Ace AX (road 3rd generation)

74xx series - New Dura-Ace (road, 4th generation)

75xx series (track, 1st generation, continued to be manufactured concurrently with 2nd generation)


Clear as mud?
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Old 08-01-20, 07:26 PM
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Originally Posted by T-Mar
Clear as mud?
LOL. indeed, sir.

jk aside, THANK YOU!!
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Old 12-09-23, 04:39 AM
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Originally Posted by T-Mar
The early model numerology can get quite tricky., which is why Shimano introduced a more standardized system in 1980.


The UA-100 was the 1st generation Dura-Ace headset but it was the road version. For 1979 Shimano introduced 2nd generation Dura-Ace EX but only in a road version. The Dura-Ace EX road headset was UA-110 being renamed HP-7200 for 1980 and being produced through 1984. It was also used on Dura-Ace AX, with the addition of a plastic cover.


The first generation Dura-Ace track headset was the UA-200. When Dura-Ace 10 was released in 1977 it didn't require a specific headset, so it continued to use the UA-200 until the 1980 renumbering, when it was designated HP-7500.


Here's the 1980s Dura-Ace numbering system:


70xx series - Dura-Ace 10 (track, 2nd generation)

71xx series - Dura-Ace (road, 1st generation)

72xx series Dura-Ace EX (road, 2nd generation, continued to be manufactured concurrently with 3rd generation)

73xx series Dura-Ace AX (road 3rd generation)

74xx series - New Dura-Ace (road, 4th generation)

75xx series (track, 1st generation, continued to be manufactured concurrently with 2nd generation)


Clear as mud?
old post, but I have a Dura Ace headset and I cannot tell if it's the UA-100/200 or 7500. Could you help me? How to spot the difference? It's french threaded. I can post pics. thanks!
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Old 12-09-23, 02:41 PM
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I have one of the JIS headsets. Stamped JIS on the lock nut. Has the 27 crown race. Missing the bearings so don't know if they were different or not.
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Old 12-13-23, 03:17 PM
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thank you T-Mar for the PM. I cannot answer you directly there as I don't have yet 10 posts so my pm are unavailable !
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