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Identify a stem

Old 12-10-12, 10:38 PM
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echo
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Identify a stem

Can anyone tell me what this stem is? I may be getting the bike it's installed on tomorrow and am confused about this stem, it's late 80's or early 90's Univega Alpina Pro mountain bike.
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Old 12-10-12, 10:39 PM
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what are the markings
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Old 12-10-12, 10:40 PM
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Often called a bullmoose style stem, IIRC.

The real-deal bullmoose setup is similar to that but one piece steam+bar combo.

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Old 12-10-12, 10:41 PM
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The top marking is SR for Sakae-Ringyo (or however it's spelled)

I think the bottom set of markings are MTS-100. Velobase has the MTS 101, which it probably pre-dates.

The only thing to be confused about would be finding replacement bars, seems like most these days are designed for single clamp stem. I guess I'd just mothball the stem/bars in a museum if you needed new bars for any reason.

Last edited by LesterOfPuppets; 12-10-12 at 10:45 PM.
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Old 12-10-12, 10:44 PM
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Originally Posted by muzpuf View Post
what are the markings
SR MTS 100, and I just found one like it: https://www.ebay.com/itm/SR-MTS-100-D...item2323fb7cb8 although this one is silver.
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Old 12-10-12, 10:47 PM
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Originally Posted by LesterOfPuppets View Post
The top marking is SR for Sakae-Ringyo (or however it's spelled)

I think the bottom set of markings are MTS-100. Velobase has the MTS 101, which it probably pre-dates.

The only thing to be confused about would be finding replacement bars, seems like most these days are designed for single clamp stem. I guess I'd just mothball the stem/bars in a museum if you needed new bars for any reason.
Great, thanks for the info, I think I will replace if I buy the bike.
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Old 12-10-12, 11:09 PM
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Looks like you already found out it was an SR MTS-100 aka "slingshot" style stem.

I had one that came on a Univega Alpina Pro, looks like it may have been the same color (purple/dark burgundy) so probably the same year. Mine was from 1984, so I don't think that one is from the early 90s.

Edit: also, forgot to mention, moreso than bars being designed for a single clamp, this one has a different clamp diameter. It was made for bmx size bars (22.2), not standard mtb clamp diameter (25.4). I was able to put a 25.4 wald north road bar in there (8095 I think) with the bulged area centered in the stem and it worked alright, probably not ideal though. I think wald also offers a cruiser bar with 22.2 clamp diameter.

Last edited by mainstreetexile; 12-10-12 at 11:13 PM.
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Old 12-11-12, 11:08 AM
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Originally Posted by echo View Post
Great, thanks for the info, I think I will replace if I buy the bike.
You may find that the steerer may be 21.1 instead of 22.2 limiting your stem choices.
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Old 12-11-12, 11:23 AM
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I've only worked on a couple of old Alpinas (I think they were both Unos), but they both had standard 1" steerers.
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Old 12-11-12, 11:24 AM
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SR MTS-100 on a 1984 Mongoose ATB.





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Old 12-11-12, 04:33 PM
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Originally Posted by chi-james View Post
You may find that the steerer may be 21.1 instead of 22.2 limiting your stem choices.
I got lucky, just got the bike and the steerer is 22.2. I believe it's a 1985 and has barley been used, everything original. Here's a pic as it was on CL in Seattle....I drove to 250 miles round trip to Tacoma to pick this up. Just needs some lube, adjustments and a good cleaning.
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