MoreCarbs

ISO integrated brake lever (for canti) and 7 speed rear shifter.

Just got a 1992 Rock Hopper with a busted shifter. Before going trying to buy a new integrated or separate shifter/brake and matching the left side to match, figured I'd see if there was something from that era floating around.
Thanks

jdawginsc 

What flavor is the left side? Brand/model...?

prairiepedaler

Hey Hondo! Thank you for offering to help out. The picture capture of the axle I'd put up is from that guys ad on da Bay. The wheel I've got has a Ritchey hub which is designed to take that axle. He must have stumbled across a NOS stash someplace. I'd entertain buying one perhaps, but don't have a da Bay or PP account. I could probably ask someone I know who does though. The seller doesn't appear to want to post outside the ConUS either.

madpogue 

Are you sure it's "busted"? As in, physically damaged? If it's something like a RapidFire or one of its stepchildren, that uses ratcheting pawls, and it's just not doing anything when you press the trigger, do you know about the various "liquid tune-up" options?

MoreCarbs

it shays shimano total integration on the shifter portion.

yeah, the actual levers have been sheared off somehow.

For now I bought a separate 7 speed shifter, and have access to standalone brake levers from a donor bike.

Mad Honk 

I am working on a mid 80's Ciooc and finding myself in need of a Campy NR left side crank arm in rider quality. I have the right with rings but it came in as a mismatched set of arms with an Ofmega Super Champione for the left. I have plenty to trade or even dead green presidents. Thanks for the help, Smiles,MH

Mr. Spadoni 

What length? ? Everything I have is rider quality

Mad Honk 

Mr. Spadoni,
Sorry for not posting length. I need a 170 left arm. Thanks, MH

JacobLee 

I have two NR cranksets with the usual crack in the drive side spider. I'll send pics of the left arms when I get home tonight.

Mr. Spadoni 

Will check tomorrow. If I have a 170 it’s yours for the asking. Your generosity in the past is much appreciated.

SJX426 

ISO: Campagnolo NR like BB lock ring. Need 2. Don't want AL version. Would prefer they not be too damaged and no rust.

JacobLee 

Here's what I have in the 170 department, if Mr. S doesn't have one.

jdawginsc 

Paging @Mad Honk

Hondo6

FWIW: Shimano's document repository website has recently been "renewed" (their term, not mine). The new URL for searching for documentation on a Shimano cycle component by model number is

https://si.shimano.com/en/manual/search

Mr. Spadoni 

Here is what I have in 170. PM me if you want it. If not, looks like you have another option.

Hondo6

OK, I’m stumped and need some help and/or advice.

I recently acquired a vintage NOS Shimano downtube shifter set for potential future use. The set I purchased had both the downtube shifter boss covers and the band clamp unit.

Unfortunately, the band clamp unit is missing the fixing bolt (or screw; Shimano has used both terms) and nut. That sees to be a common issue with both new and used shifter clamps. I’d like to have the option to use the clamp in the future.

The specific part I’m looking for is circled in red in the annotated photo below.



A review of Shimano documentation indicates their later band clamp unit nuts appear to be all of the same general design - though the nuts had two different part numbers (multiple screw/bolt part numbers were used). Shimano documentation says that the SL-7200, SL-7300, SL-7400, SL-6300 and SL-6200 all used the same fixing nut as the SL-1050 (part number 681 3800). The SL-A105, SL-AT31, SL-AX10, SL-L412, SL-L422, SL-S434, and SL-Z408 clamp-on versions used a clamp bolt/screw nut that appears virtually identical (that nut’s part number was 681 3801). I’m sure I missed a number of others. The screws and nuts all appear to have been M5 threaded.

At some point, Shimano ceased listing the individual part numbers for their band clamps and started to sell it as a "band clamp unit", complete. But I’d bet that either of these two nuts (part numbers 681 3800 or 681 3801) – or a nut from any Shimano clamp using this type of flatted clamp nut, for that matter - would work with the clamp I have.

The screw/bolt isn’t an issue – I can find a stainless M5 bolt or screw (and washer, if needed) that will work. But the nut is a different story; it’s rather unusual. It’s a special design; it’s recessed to fit mostly inside the clamp and flatted to keep it from turning as the clamp screw is tightened.

The problem is I can’t find just the nut - or a nut and bolt/screw combo - anywhere. Maybe I’m using the wrong Internet search terms. Maybe no one has one for sale separately. Maybe Space Aliens abducted them all and took them to Alpha Draconis or Zeta Reticuli. (smile) Dunno. But “No can find”.

Can anyone point me at a source for a Shimano clamp band fixing nut (or nut and bolt/screw) of this type? Doesn’t have to be pristine, just needs to be usable if needed and not so foul-looking as to attract the EPA’s attention. (smile) I really don’t feel like buying yet another entire shifter set or band clamp unit that I don’t need just to get that particular nut (or nut and bolt/screw).

Or, alternatively: does anyone have suggestions for a workaround that would look like it actually belongs after it’s installed? Not adverse to that, either, if it turns out I can’t find the appropriate fixing nut.

Thanks in advance.

madpogue 

A chainring nut might fool some of the people, some of the time. Just need a short enough bolt (or cut it) that doesn't look dorky sticking out beyond the nut threads.

Hondo6

Thanks for the suggestion, madpogue; I'll keep it in mind if I can't find an appropriate nut. But using one of those would require drilling the clamp (on both sides) to enlarge the mounting holes substantially. I'd prefer to do that as a last resort only.

madpogue 

Hm, yeah, I forgot that chainring bolts/nuts are larger than M5. But I think there are nuts of a similar design to chainring nuts, in M5x0.8 size.

Hondo6

There are - and they also exist in M4x0.7mm and M3x0.5mm. The M4 version has a body that's 5mm in diameter, which might or might not work without any mods. I'm almost positive the M3 version will, but is rather skinny. Matching bolts in Torx head exist for all of these. They're available in stainless.

Your suggestion prompted me to find a link for those, which I have bookmarked for possible future use. Thanks.

VintageSteelEU

Shimano had three standards of shifter lever boss covers: one for the shifters mounted on the clamp, where the covers have an additional cutout for the clamp itself (the type you have in your diagram), one for braze-on lever bosses (without any cutouts) and one for non-standard tubing (I think for alloy or aero profile tubing). These are generally not interchangeable or I don't think they are. Haven't tried, but I think one would encounter problems stemming from different thickness. Just mentioning that if you were putting the shifters on the frame with braze-on bosses, you might need different covers.

As for the bolt and nut, your best option might be getting another set of clamp on shifters and canibalise it. Anything Shimano from the era, including the most basic friction shifters, should probably use similar bolt and nut, so hopefully you will be able to find something without paying exorbitant money for it. Whenever I'm looking for any small Shimano parts from the 80's, bolts, nuts, shifter bosses covers, they tend to be difficult to find on their own. There are alternatives though:
1. Shimano downtube / bottom bracket cable guides use a bolt that would fit the shape of the downtube shifters clamp. So you could use it with any M5 nut.
2. Suntour PowerShifters on a downtube clamp use a bolt which would fit the shape of the Shimano downtube shifter clamp. The Suntour nut could be just turned around (or not, actually, should work, thinking of it) and used or any other fitting nut could be used (I think it's also M5). I have verified it just now, it fits Shimano clamp and is snug. I think Huret used thinner bolts and Simplex used a system with a nut shaped like letter D (if I remember correctly, no idea where I put one Simplex clamp I have).
3. M5 bolt with washers on both sides of the clamp and a M5 nut.
4. Possibly cable clamp for Weinmann type caliper brakes, but these bolts might be too short and you might not get much purchase on the nut. They do fit the shape, at least one I have, but one has to remember they can have several diameters.

SquireBlack 

VintageSteelEU had some excellent suggestions. Here are a couple more:

1. It's possible to buy M5 Press Nuts in stainless. These have a circular head (which you want) and a circular shaft, to which you could probably add flats with a file. If the shaft diameter is too small, you could add some silver braze material, and then file that.
2. In your diagram, part 16 looks very similar to the part that you seek, except that it's longer. Easily fixed with a hacksaw and a grinding wheel. Bike co-ops around here seem to have lots of band clamps that could be suitable donors for part 16.

oneclick 

I knew I had one of those sets of shifters.

The bolt and nut you need are these:



But they're mine, and you can't have them. You CAN, however, have this copy of the nut in brass for use with a suitable screw:



(Some stuff is quick and easy if you have a lathe.)

So pm me a physical address and I'll stick it in the post.

Hondo6

Thanks for the additional suggestions; I'll check out the press nut link. I've also found a source for stainless circular-shaft recessed nuts with hex heads, which might also work without modification (if the shaft is small enough to fit between the flats on the clamp, the hex head on the recessed nut would eliminate the need for any flats if used with a bolt of correct length - and the circular head would hide the hole nicely). They're available in sizes as small as M3; I think M4 might work best.

The shape of part 16 is indeed similar. It's M5 also threaded and appears to be chromed steel. Unfortunately, it's also considerably thicker between the flats and appears to be about 50% longer than the correct band clamp nut; its circular head might also be too big in diameter (can't really tell - it's pretty close either way). It's also an essential part of the band clamp unit (it fits in the clamp and provides the shaft that's normally provided by braze-on mounting bosses); you can't use both shift levers if you don't have both of them.

Those are also rather hard to find separately - would probably have to buy another clamp to get one, and then would have to do rather extensive modification for something that would have a serious rust issue afterwards due to lost chrome plating. Plus, my skills as a machinist are, to be charitable, rather limited. I'd rather avoid modifying a part if I can help it. (smile)

Rather than going that route, the "buy a used clamp that's complete and cannibalize the nut" route is probably the one I'd choose.

Hondo6

The band clamp unit for the shifter set I bought was complete other than the mounting nut and bolt, so I have the correct clamp boss covers. The set also came with a set of braze-on boss covers (which is one reason I bought it - with a suitable bolt/screw and nut for the clamp, it would be usable for both types of downtube mounting).

Interesting info about the clamp-on Suntour Power Shifters and Weinmann caliper brake cable clamp nuts; thanks. I'd probably cannibalize one of those and use it if needed - if I had either. Unfortunately, I don't. (smile)

Your 3rd suggestion is my fallback if I can't find the proper nut and can't make one of the other options (recessed nut, press nut) suggested above work suitably.

The suggestions and info are much appreciated. Thanks.