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Sunshine Gyromaster

Old 07-24-20, 12:01 PM
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seedsbelize 
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Sunshine Gyromaster

While looking for hub dimensions, for a wheel build, I read that some Gyromasters have cartridge bearings. Can anyone tell me when they made the switch? '83 is said to be cartridge. Mine is '80. My initial thought was to open it up and see, but it spins so nicely, I don't want to touch it.
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Old 07-24-20, 12:49 PM
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I don't know when they changed, but you can tell the difference by looking at the hub. If it's a cartridge bearing it's exposed, there is no dust cap. If they're cup and cone there will be a dust cap. Picture of a cartridge bearing hub was borrowed from the internet.


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Old 07-24-20, 02:15 PM
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I put regular miles on a pair of Gyromasters and have come to really like them. Plus it’s a great name. Here’s a pic (not mine) showing dust cap version over cup and cone.


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Old 07-24-20, 03:07 PM
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The 1982 Sunshine catalog specifically states "cup and cone" for the Gyromaster hubs, so anything up to that date should be the same.
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Old 07-24-20, 04:28 PM
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Interesting, I didn’t know there was a cup & cone version first. 🤔 I’m glad my Miyata is an ‘85, so I got the cartridge bearing ones. 😎
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Old 07-24-20, 07:32 PM
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Mine are 81 models, smooth, very smooth cup an cone goodness!
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Old 07-24-20, 08:22 PM
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One set HF Gyromaster on 72 Finest and a set of low flange wheels from a 77 parts bike Smoooooth

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Old 07-25-20, 04:26 AM
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Sounds like a Kurt Vonnegut title.
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Old 07-25-20, 08:55 AM
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Some of the Fujis that were coming into the shop I worked at in late 1978 had the very first Gyromaster Sealed-bearing hubs I had ever seen.

It seems to me that these came well before the cup/cone Gyromasters that I've found on many early-1980's bikes.

The "mid-flange" cartridge version was a great sales-pitch feature. I even put them on my own bike at some point and had slight issues with the fitting of the Avocet magnet ring because of the odd flange diameter.
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Old 07-25-20, 10:00 AM
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Just grabbed a quick pic of the front. The whole bike’s pretty dusty right now, but it’s good solid road dust, not garage or barn dust, lol. 😁😉
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Old 07-25-20, 10:09 AM
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I just realized, I can grab more than one pic, pretty easy. 🙄😁

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Old 07-25-20, 03:10 PM
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Well, it appears I have cup and cone. But they are very smooth spinning hubs. I was thinking to use it as a replacement wheel on a give-away bike. I'll dig around and see what else is in the bin. These were OEM on the '80 Trek 414 I bought, last Spring, in NE Ohio. When boxing it for the airplane, I couldn't make the rims fit, so I left them. I think I may have a pair of high flange too.
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