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Ask DocSk8 (Expert Indoor Skate Building Advice) This forum is different then the other SkateLog forums in that it is not a discussion forum, but rather a place you can ask skate building expert Fred "DocSk8" Benjamin about building and repairing indoor speed, derby, and jamskate quad roller skates. Please start a new thread for each new question.

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Old November 18th, 2019, 09:45 PM   #1
BretMan
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Default Converting to Precision Bearings

I picked up a nice old pair of skates with Chicago plates and Hyde boots. And they're loose bearing! Cleaned them up, lubed the ball bearings and they skated well. But I was wondering about converting them to precision bearings.

It's been a long time since I messed with loose bearings! Will a 7mm bearing fit the axles? Or would I need to replace the axles with something a different diameter?

Thanks!
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Old November 19th, 2019, 06:58 PM   #2
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Depends upon the current axle but most of them can be converted. Pics?
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Old November 19th, 2019, 09:11 PM   #3
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I'll have to work on getting pics. They're just typical loose ball bearing wheels, with two cones, one on each side of the wheel. If memory serves from the last time I worked on loose bearing wheels (30 years ago!) axles are all threaded, 5/16" thread???
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Old November 23rd, 2019, 12:59 PM   #4
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I'll have to work on getting pics. They're just typical loose ball bearing wheels, with two cones, one on each side of the wheel. If memory serves from the last time I worked on loose bearing wheels (30 years ago!) axles are all threaded, 5/16" thread???
sometimes u have to replace axles to get the bearings to fit.
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Old November 24th, 2019, 06:51 PM   #5
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Default Be aware

This is Doc Skates page. When asking questions in here, he answers first.
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Old November 25th, 2019, 02:06 AM   #6
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sometimes u have to replace axles to get the bearings to fit.
That's what I was thinking, but since the last pair of skates I converted was around 1980...couldn't remember.

Loose ball axle is 9/32" (.281" ) and 7mm is .276" ...so it might be a snug fit!

I might just leave these as is, all original, as a relic of the past. I skated them last week and they work perfectly. Besides, I picked up a new project this week...some old school Riedell 265's with XK4 plates, Hartford bearings, and Zingers! Basically the same set up I used back in the 70's and 80's. I'm trying to get them ready to skate next weekend.

Last edited by BretMan; December 2nd, 2019 at 12:31 AM.
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Old November 25th, 2019, 09:23 PM   #7
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Sorry about the reply. I did not realize which posts I was on. Yes Doc is amazing and will chime in I am sure.
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Old November 28th, 2019, 12:47 PM   #8
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This is Doc Skates page. When asking questions in here, he answers first.
yes he does most of the time,,,,but I have permission
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Old November 30th, 2019, 11:42 PM   #9
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Thumbs up He is correct.

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yes he does most of the time,,,,but I have permission
Rick has permission.
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Old November 30th, 2019, 11:49 PM   #10
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Talking Now back to the original question.

I have yet to run into a loose ball axle that that will fit inside a "typical" modern 7mm (627) bearing. That said, I just changed the axles on a Cleveland 400. It had precision bearings, but they looked like something out of the skateboard universe w/ a built in spacer. Same axle OD as a loose ball but not a loose ball axle. No flat on the end and not threaded across. Looked like a regular axle.


Now as far as your old XK4s.... I have seen those w/ loose ball axles as well. The old ones had the short height trucks too, which do not like 62mm wheels.
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Old December 1st, 2019, 12:53 PM   #11
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Rick has permission.
thanks and I agree with u on the axles,,,,,hope all is well
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