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Old 11-12-08, 09:51 PM   #1
Flash
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Latest shimano 10 speed groups OK on 126mm spaced frames?

I'm looking to upgrade one of my mid-80s Japanese steel bikes. This bike originally had downtube shifters and rear spacing is 126mm.

I'd like to upgrade to STI and was wondering:

-- are the newer 10spd hubs (ultegra 6600) spaced at 130mm?
-- if yes above, can I comfortably run all new 10spd ultegra componentry on this bike? I'm guessing the newer 10spd cassettes take up the same space in the rear as previous 9spd cassettes, with the cogs and spacers being a bit "thinner."
-- any cable routing issues I should expect to encounter as I install the brifters and ditch the downtube shifters?

thanks
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Old 11-12-08, 10:03 PM   #2
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You'll be able to squeeze the hub in that steel frame just fine as it is only a 2mm spread per side. You can also have the stays permanently spread.

And, yes, a 10-speed cassette is the same width as a 9-speed (actually it's a bit narrower).

You'll need cable stops to replace the downtube shifters.
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Old 11-12-08, 10:27 PM   #3
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You'll be able to squeeze the hub in that steel frame just fine as it is only a 2mm spread per side. You can also have the stays permanently spread.

And, yes, a 10-speed cassette is the same width as a 9-speed (actually it's a bit narrower).

You'll need cable stops to replace the downtube shifters.

Thanks. I'm also considering the Sheldon Brown "8 of 9 on 7" trick, placing eight 9 speed cogs with 9 speed spacers on the existing 7 speed hub. Sheldon suggests the existing 7spd derailleur will work OK with this, along with 9spd shifters. Anyone actually try this?

As you see in the pic below, my Z408 downtube shifters were mounted onto that "bump." Does an STI upgrade look do-able in this situation? thanks

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Old 11-12-08, 10:42 PM   #4
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You'll need clamp-on cable stops for the downtube. Difficult to tell much about the "bump" from the photo, but did the bike happen to have Suntour Symmetric downtube shifters on it? I've got a bike with a similar situation, with a brazed on mount for the Symmetric shifters. Not good for anything but mounting those particular shifters-
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Old 11-12-08, 10:50 PM   #5
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You'll need clamp-on cable stops for the downtube. Difficult to tell much about the "bump" from the photo, but did the bike happen to have Suntour Symmetric downtube shifters on it? I've got a bike with a similar situation, with a brazed on mount for the Symmetric shifters. Not good for anything but mounting those particular shifters-
thanks for the tip. Here is a pic of the shifters. I think we're in the same boat.

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Old 11-12-08, 10:58 PM   #6
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thanks for the tip. Here is a pic of the shifters. I think we're in the same boat.
Yes, those are similar to the Suntour Symmetrics. Unlike most downtube shifters, they install as a unit instead of separately, thus the need for the "bump" in the center of the downtube to mount them to. For your STI setup, you can mount clamp-on cable stops just above the bump and it will keep the clamp from moving downward on the downtube-

Last edited by well biked; 11-12-08 at 11:06 PM.
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Old 11-13-08, 12:48 AM   #7
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I recall seeing some of those shifters that were modified to accept cable stops. I think it was in the C&V forum. I'll check and repost if I can find it.

Help - downtube shifter keeps slipping

Last edited by Benjamino; 11-13-08 at 12:57 AM.
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Old 11-13-08, 03:21 AM   #8
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im running STI on my 1972 raleigh super course with good results......anything can work if you want it to, right?
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Old 11-13-08, 07:11 AM   #9
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Assuming your downtube is the former steel tubing standard 1-1/8" diameter, there are clamp-on double downtube cable stops available. They were used on good quality bikes with barend shifters and on cheap bikes with stem shifters and will work in this service too. You should be able to find them NOS in any long-established bike shop and I believe Tektro still makes them.

They have no barrel adjusters. Rear derailleurs come with a built-in barrel adjuster but you will need an in-line cable adjuster to set up the front derailleur.
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