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How to measure cartridge style headset bearings in order to correctly replace them

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How to measure cartridge style headset bearings in order to correctly replace them

Old 06-02-17, 10:15 AM
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jambon
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How to measure cartridge style headset bearings in order to correctly replace them

Hi ,

I have a threaded headset which feels very grainy . On opening it up I found that it had two very worn out rust scarred cartridge bearings .

How do I measure these in order to find out what replacements need ordering ?

There are no markings on the insides or outsides of the bearings .

I have emailed the company that made the headset , it's a MODUS MH201AC Headset, Taiwanese , but they have not got back to me .

Thanks for any pointers ,

J
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Old 06-02-17, 11:21 AM
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Do You Own an Accurate Caliper, to measure what you have?
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Old 06-02-17, 03:07 PM
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Cheap enough and easier to replace the headset. 1" is easy to find, lots of good stuff out there.
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Old 06-02-17, 03:09 PM
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For a basic threaded, cartridge bearing headset like that I would say just buy a new headset. The hassle of tracking down the bearings & their likely (high) cost make a new headset more feasible in my mind.
With that said - I had a Shimano 105 cartridge bearing headset & the lower bearing siphoned in water & rusted pretty badly. I tried to flush it out & re-grease it but more rain riding made the bearing terrible. I lucked out on eBay & sourced some upgrade quality Dura Ace bearings. I bought 2. Only the bottom one was bad so I saved the extra one as a spare. Shimano bearing dimensions seemed proprietary to their brand but I cannot say for sure,
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Old 06-02-17, 05:01 PM
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Originally Posted by masi61 View Post
I had a Shimano 105 cartridge bearing headset & the lower bearing siphoned in water & rusted pretty badly.
I've had good luck with these Lizard Skins headset seals: LIZARDSKINS LIZARD SKINS BICYCLE HEADSET BOOT PROTECTOR SEAL HEADSEALGUARD NEW | eBay
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Old 06-02-17, 07:09 PM
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get the entire, new, headset... the cups can get worn, if the bearings go bad, and the wiper seals are probably worn, too... they cost about 20 bucks, shipped, and up... or go to your local shop, they will have one in stock... take the old, THREADLESS, 1" headset with you as an example...

or, if reinstalling one is not within your skillset, take the entire bike in with you.
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Old 06-02-17, 07:14 PM
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Originally Posted by masi61 View Post
For a basic threaded, cartridge bearing headset like that I would say just buy a new headset. The hassle of tracking down the bearings & their likely (high) cost make a new headset more feasible in my mind.
With that said - I had a Shimano 105 cartridge bearing headset & the lower bearing siphoned in water & rusted pretty badly. I tried to flush it out & re-grease it but more rain riding made the bearing terrible. I lucked out on eBay & sourced some upgrade quality Dura Ace bearings. I bought 2. Only the bottom one was bad so I saved the extra one as a spare. Shimano bearing dimensions seemed proprietary to their brand but I cannot say for sure,
it's a THREADLESS style... i looked it up.
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Old 06-03-17, 07:40 AM
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Tracking down exact fit bearings is a little more difficult than simply finding bearings that will do the job. Accurate calipers won't help you measure the chamfers on the bearing OD and ID, and both angle and depth are important for proper fit, though the latter can vary a bit without causing major issues.

For 1" headsets, most cartridge bearings will be 38mm OD x 27.15mm ID with thickness in the 6-7mm range. Chamfer angles can be 36 or 45 degrees and won't always be the same between outer and inner race. Good luck finding a vendor who can actually tell you what the depths of their chamfers are.
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