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What is this doo-hickey? (Trek 2300 build)

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What is this doo-hickey? (Trek 2300 build)

Old 07-15-16, 07:21 PM
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Shinkers
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What is this doo-hickey? (Trek 2300 build)

Hey,

Just got this frame to build and there's a weird barrel adjuster on the drive side.

It almost looks more like a quick release.

Any ideas? I've never seen one.

Most beautiful frame I've owned (pathetic as that may be, I think this thing is gorgeous).

Thanks.
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Old 07-15-16, 07:24 PM
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That's an early Dura Ace STI downtube cable stop with adjuster that functions like an in-line barrel adjuster.

Example:
Shimano Dura-Ace STI Adaptors For Steel Frame | Chain Reaction Cycles
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Old 07-15-16, 07:25 PM
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I don't know what type of adjuster it is on your cable stop, someone here will tell you shortly.

Nothing shameful at all about the frame and your feelings, here its the normal!

Bill

I type too slow, you now have an answer to your original question.....
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Old 07-15-16, 07:28 PM
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What brandon98 said. It's made for those extreme riders who supposedly shred so hard that they might need to adjust the tension on their rear derailleur cable without even stopping the bike.
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Old 07-15-16, 07:48 PM
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They're pretty common barrel adjusters from the 90s. My '94 litespeed tachyon came with one.
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Old 07-15-16, 08:10 PM
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Okay, so what I find odd is that the drive side adjuster has a stop. It will only go half a turn before it's not doing anything.

Also, if you had the adjuster at the half way point, you have the large flange sticking out.

I'm familiar with barrel adjusters but this one has me a bit puzzled.
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Old 07-15-16, 08:18 PM
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I believe they work for bar cons to, if you swing that way.
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Old 07-15-16, 11:48 PM
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It's not a bad option to have that small amount of adjustment on a race bike. If you have new cables installed, they always loosen somewhat after a little ride time. Rather than stop and spend 5 minutes adjusting the derailleur tension, that will keep you riding, and adjusted properly on the fly.,,,,BD
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Old 07-16-16, 12:19 AM
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Yep. They're awesome. And it took me awhile to figure what they were for on my 1991 Trek 2100 when I had it. It was my first "modern" bike
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Old 07-16-16, 12:26 AM
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In contrary to the more popular shifter boss barrel adjuster, the adjuster with indexing steps pictured above costs quite a bit more than the prior.

It's to allow for quick and indexed on the fly adjustments while on the saddle.

I believe this is a shimano creation.
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Old 07-16-16, 04:05 AM
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I have one on my 2000 C'dale. AFAIK they were only intended for indexed shifting where the cable tension may only need a wee bit of adjustment. I've used mine while riding, if I start to hear a rattle from the rear end. Add a notch or two of tension or take a notch or two out - listen to see if the rattle gets better or worse. That way I know what to do when I stop to work the adjuster. I keep mine at the mid point and the "large flange sticking out" has caused no problems. I don't notice it. Once I couldn't get the rattle out and finally determined that the RD hanger was tweeked a bit. Took care of that.
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Old 07-16-16, 05:01 AM
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+1, a it's cable barrel adjuster for the rear derailleur of a bicycle equipped with Shimano STI (i.e. brifters) or Shimano SIS bar end shifters. The barrel adjuster should give you five clicks, with each click corresponding to the same adjustment as a 1/4 turn of barrel adjuster on the rear derailleur. This was deemed the minimum adjustment increment with Shimano SIS indexed shifting. They were introduced on Dura-Ace and specifically designed for competition, to allow you to fine tune the cable tension for correcting minor indexing issues, without dismounting.
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Old 07-16-16, 05:06 AM
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Yep, I've got several of them in a drawer.
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Old 07-16-16, 07:04 AM
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Originally Posted by Trsnrtr View Post
Yep, I've got several of them in a drawer.
I do as well, put them on everything, they are the proverbial "better mouse trap".
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Old 07-16-16, 07:48 AM
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Originally Posted by T-Mar View Post
+1, a it's cable barrel adjuster for the rear derailleur of a bicycle equipped with Shimano STI (i.e. brifters) or Shimano SIS bar end shifters. The barrel adjuster should give you five clicks, with each click corresponding to the same adjustment as a 1/4 turn of barrel adjuster on the rear derailleur. This was deemed the minimum adjustment increment with Shimano SIS indexed shifting. They were introduced on Dura-Ace and specifically designed for competition, to allow you to fine tune the cable tension for correcting minor indexing issues, without dismounting.
Okay that makes more sense. Thanks for the explanation.
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