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Old 07-14-11, 05:19 PM   #1
sillygolem
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Another "What is this thing?" thread

What are these round things at the top of the chainstays?



This is on an early-90's Giant Acapulco. They're threaded, but because of the brake cable routing they don't seem to be in the right place for a rack mount.
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Old 07-14-11, 05:26 PM   #2
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Rear rack mounts.
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Old 07-14-11, 06:57 PM   #3
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yup, rack mounts. pretty common on mtb's.
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Old 07-14-11, 07:40 PM   #4
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And on lots of touring bikes and sport tourers.

Neal
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Old 07-14-11, 08:10 PM   #5
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... and very commonly located such that they don't fit any known rack or interfere with the brake... as you've noticed.
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Old 07-14-11, 08:12 PM   #6
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If not used for rack then they are used for screw in reflectors...

http://www.chinapartsdepot.com/shopp..._reflector.JPG
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Old 07-14-11, 08:24 PM   #7
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i used them on my mtb with a cheap performance blackburn ripoff rack.




but i didnt say it was pretty.
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Old 07-14-11, 08:27 PM   #8
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I'm glad you covered your couch with a sheet before you let your bike sleep on it.

Neal
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Old 07-14-11, 08:27 PM   #9
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Originally Posted by rhm View Post
... and very commonly located such that they don't fit any known rack or interfere with the brake... as you've noticed.
...and seeing how the frame has massive braze-ons for canti brakes, it's not like they aren't going to route a cable that way.
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Old 07-14-11, 08:30 PM   #10
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If not used for rack then they are used for screw in reflectors...

http://www.chinapartsdepot.com/shopp..._reflector.JPG
Remember, red on the starboard, green on the port.
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Old 07-14-11, 08:30 PM   #11
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i used them on my mtb with a cheap performance blackburn ripoff rack.




but i didnt say it was pretty.
This bike looks almost the same (including the "Classic Hi-Ten" logos) but it's a short women's frame which puts these mounts well below the top of the tires.
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Old 07-14-11, 08:32 PM   #12
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...and seeing how the frame has massive braze-ons for canti brakes, it's not like they aren't going to route a cable that way.
True, but the arms on the racks are usually pretty thin at this point. It should be possible to run the cantilever bridge in such a way that they don't interfere. Should be. There's the problem.
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Old 07-14-11, 08:32 PM   #13
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I have small knob on the inside of one of the chain stays on my road bike. It's only on the one side - what's that for?
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Old 07-14-11, 08:32 PM   #14
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I'm glad you covered your couch with a sheet before you let your bike sleep on it.

Neal
thinking about what i used to do with my gf on my parents couch when i was a teenager i thought it was best.

btw, eventually i rode through this with that bike:



then it died when the rear mech went into the spokes



then i upgraded it a few times and eventually turned it into this



next time i ride a century with you Neal you have to ride this so I can keep up with you.
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Old 07-14-11, 09:34 PM   #15
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... and very commonly located such that they don't fit any known rack or interfere with the brake... as you've noticed.
It's generally not a problem to bend the rack stays to fit these mounts.
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Old 07-14-11, 09:36 PM   #16
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I have small knob on the inside of one of the chain stays on my road bike. It's only on the one side - what's that for?
Chainstay or seatstay?

On the seatstay it would be a chain hanger to hold the chain when you remove the wheel.
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Old 07-15-11, 07:36 AM   #17
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Chainstay or seatstay?

On the seatstay it would be a chain hanger to hold the chain when you remove the wheel.
Oops, you're right - seat stay. Chain hanger, eh? Who'da thunk it. Thanks!
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Old 07-15-11, 07:52 AM   #18
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next time i ride a century with you Neal you have to ride this so I can keep up with you.
Only if I get to ride in the kid's seat.

Neal
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Old 07-15-11, 08:18 AM   #19
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Originally Posted by sillygolem View Post
This bike looks almost the same (including the "Classic Hi-Ten" logos) but it's a short women's frame which puts these mounts well below the top of the tires.
I'm confused, these are clearly above the tires. Is your image not of the bike you're dealing with?



I have seen mid-seatstay braze ons, but wouldn't expect to find those on a Giant Acapulco.
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Old 07-15-11, 12:53 PM   #20
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I'm confused, these are clearly above the tires. Is your image not of the bike you're dealing with?
Yes. Here's a better shot to see what I'm talking about:

You'd have to have rack mounts that bend downward considerably to reach the braze-ons.
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Old 07-15-11, 01:16 PM   #21
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its cause it's a small frame i guess
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Old 07-15-11, 01:34 PM   #22
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Remember, red on the starboard, green on the port.
uh .. no. red is the color of a nice port wine (or almost)

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Old 07-15-11, 04:40 PM   #23
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Yes. Here's a better shot to see what I'm talking about:

You'd have to have rack mounts that bend downward considerably to reach the braze-ons.
Most racks are not one-size-fits-all. They inevitably require some manipulating to make them fit. This seems all the more problematic with anything but wire racks.

Wire frame racks will allow you to bend them where you need them. Unless I was setting up a bike for randonneuring, or heavy hauling, that is the kind of rack I would lean towards.

The hefty, rock-crusher racks seen so much today are nice and strong. Tres useful when loads get really big - and they impress the heck outta other cyclitsts.

But for a lot of towning uses, they aren't really necessary. You gotta balance your needs.
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Old 07-15-11, 10:19 PM   #24
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Yes. Here's a better shot to see what I'm talking about:

You'd have to have rack mounts that bend downward considerably to reach the braze-ons.
Ah, I see. I had a similar configuration on this Univega. It looked odd, but worked fine.

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