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Dura ace 7700/ Ultegra compatibility

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Dura ace 7700/ Ultegra compatibility

Old 11-07-22, 09:09 PM
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Gods lonely man
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Dura ace 7700/ Ultegra compatibility

Can I get away mixing Dura Ace 7700 ST shifters and RD with a Shimano 600 Ultegra hub with a 8 speed Hyperglide cassette? I guess a 9 speed cassette would be the correct choice but I am trying to safe money on this build.
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Old 11-07-22, 09:14 PM
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The derailleur system doesn't care about the hub at all. It's also very forgiving about cassette brand.

However the number of gears, ie. 9s vs. 8s is absolutely critical, with no margin for error.
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Old 11-07-22, 09:34 PM
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Maybe there is some ratty way I can limit the RD cable to 8 speeds
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Old 11-07-22, 10:25 PM
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If your 8 speed cassette has full cogs, no carrier/spider, just open it up and sand the plastic spacers from 3.00mm to 2.56mm (technically 2.54 because the 8 speed cogs are .02mm thicker… in theory).

Set up the shifter on the 1st position smallest cog and use the RD limit screw to to block off the last shift. Actually you want a skosh of play after the 8th position so you don’t wedge the shifter pawl and ratchet. Easy peasy.

John

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Old 11-07-22, 11:08 PM
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Originally Posted by Gods lonely man
Maybe there is some ratty way I can limit the RD cable to 8 speeds
As noted by the post above, it's not about the added sprocket, but about the spacing between them.

Imagine climbing stairs with your stride wider than the steps. By the third step you'll trip and fall on your face.
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Old 11-08-22, 05:18 AM
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One vendor on Amazon has SRAM 11-26 PG950s for sale for $18.

https://www.amazon.com/SRAM-PG950-9-...1-5&th=1&psc=1

I'm not sure you're going to find a new 8-speed cassette much cheaper than that. And I'm pretty sure 11-26 is within what Shimano says the 7700 will handle for a largest sprocket.

Other good 9-speed cassettes can be had in the $30 range.

Personally, I'd use the correct cassette (e.g., 9-speed). I'd probably go with the SRAM - and at that price, I might well order a replacement for when the first wears out.

But it's your money and your bike - as well as your time/trouble/frustration if you want to go the "I'll use mismatched parts and see if they work well enough" route instead.
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Old 11-08-22, 05:47 AM
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The one issue with a Shimano 600 Ultegra hub is that it is most likely an FH-6402 and has a UG/HG 8 speed freehub body.

This doesn’t prevent using a 9 speed cassette, but it does limit the cassette to a 12t or larger 1st position cog. Of course that also applies to any 7, 8, 9, or 10 speed cassette.

John
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Old 11-08-22, 06:09 AM
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Thank you guys for explaining it , I barely work on geared bikes, I will check the 9 speed cassettes, ( with the cog size limitations) I really want to use the 7700 shifters , they feel awesome, I guess they deserve proper shifting.
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Old 11-08-22, 06:47 AM
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9-speed cassettes are fairly cheap:

https://www.google.com/search?q=9-sp...hrome&ie=UTF-8
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Old 11-08-22, 07:01 AM
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Originally Posted by 70sSanO
The one issue with a Shimano 600 Ultegra hub is that it is most likely an FH-6402 and has a UG/HG 8 speed freehub body.

This doesn’t prevent using a 9 speed cassette, but it does limit the cassette to a 12t or larger 1st position cog. Of course that also applies to any 7, 8, 9, or 10 speed cassette.

John
Good point.

OP: if you do indeed have a UH/HG hub (if it has threads over the last few mm of the freehub splines, then it's either UG or UG/HG), the 11-25 SRAM cassette I suggested may not work without a bit of extra effort.

The late Sheldon Brown indicated that early HG hubs (and presumably also UG/HG hubs) could use an 11-tooth smallest cog by adding a 1mm spacer behind the cassette. Haven't personally had to do this yet (haven't used an 11-tooth smallest cog on a hub that old - yet), but the man knew bikes. I'd consider it if you want an 11-tooth smallest rear cog or can't find a 12-xx cassette you like.

In theory, you could also carefully mill or file 1mm or so off the end of each spline on your existing freehub to allow the 11-tooth cog to fit. But I'd be very reluctant to try that for fear of metal shavings/dust getting where they didn't belong. I'd go the freehub swap route instead (provided you can find a compatible freehub) or try the spacer first.

Last edited by Hondo6; 11-08-22 at 07:06 AM.
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Old 11-12-22, 10:05 AM
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a 9 speed cassette will work on an ultegra 8 speed hub, it will save you the money on your wheel and for further upgrades. Try to look for a new old stock cs 7700 dura ace cassette sprocket on ebay
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Old 11-12-22, 10:19 AM
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Low cost 9 speed cassettes are very available, with a lot of low cost options. You are asking about 9 speed brifters, get a cheap 9 speed cassette would be the easiest, and likely the cheapest, way to go. Cheaping out for something is not so cheap if it does not work properly. I would send you a used, in good shape, 9 speed Shimano cassette for $20 shipped. I have various sizes.
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