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Post by donkeychomp on May 10, 2023 23:20:07 GMT 1
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Post by JonW on May 11, 2023 0:19:02 GMT 1
Ive not tried em nor heard of anyone doing so.
My concern is that cos of the cage that they have less balls than OEM would use.
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Post by elsiefan on May 11, 2023 0:47:53 GMT 1
Just replaced my head races and there are 38 oem balls in total, this set up has 30. Cost me a lot more than £12.95 for the head race set though. But where oem parts are still available, that was what I used. You pays your money and takes your choice.
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crigar
Weekend rider
Posts: 88
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Post by crigar on May 11, 2023 8:29:55 GMT 1
I would prefer conical bearings.
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Post by JonW on May 11, 2023 9:25:50 GMT 1
I always use tapered bearings. I reckon they are fine as they used in much heavier applications.
There will be wingers at the fact they are now as low in height as the OEM ball/race setups, but if you look at how the weight/forces work with this area its not like any sticking up and less threads in the top bolt etc etc is an issue and it about to fall apart on you. And, you can mitigate by playing with other options in the fixings etc.
Not totally related to this, but I do think quite a lot of people use things and not look at how the forces are applied in the application etc. Eg how many people think about and try to understand what the axle does in the wheel setup or swinger pin etc. Not that many i'll wager, most just use it and assume mechanical knowledge from lego/mecano they used as a kid or basic designs of bbq cart wheels etc etc. Nothing wrong with that, but dont go sticking grease on these axles expecting things to spin around em lol The grease is there so they dont rust in place, use sparingly... the collars and bearings do the work, the pin/axles hold things in place.
Anyway, the lack of balls (numerically proven by elsiefan above) is my worry here and what i mentioned before. That's more weight on each ball and each ball has a very small surface that touches the race (imagine a circle on a horizontal line - not much contact), if you land a few wheelies i doubt they would survive... and that all assumes they are high quality, which i bet they arent. How hard are they and the races. Once you get even light marks, you get loose and notchy steering and you could crash and the marks never get better, only worse.
Buyer beware I guess.... not for me if that helps?
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Post by cb250g5 on May 11, 2023 11:01:14 GMT 1
I'm not sure it matters for steering head bearings really, but caged balls like this are a better engineering solution than crowded balls. If you think of them all pushed together, and rotating. The left hand side of one is touching the right hand side of the next one, but they are moving in opposite directions, so they rub against each other.
Like I say, not a big issue for steering head bearings, but my Scott big ends use crowded bearings, and there are reported issues of them skidding, if using modern oils, as the friction between the oppositely moving balls can be greater than the friction to the races.
I'd use this type in my steering head, if I couldn't find tapered ones.
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Post by midlifecrisisrd on May 11, 2023 12:11:12 GMT 1
Yes very cheap but Chris doesn't usually sell tat
Steve
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Post by Robbieben on May 11, 2023 13:23:07 GMT 1
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Post by donkeychomp on May 11, 2023 15:43:06 GMT 1
Tapered it is! Thanks lads.
Alex
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Post by LC_BOTT on May 11, 2023 20:15:14 GMT 1
Could also check on Simply Bearings etc, might save a few £££'s
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Post by billbott on May 12, 2023 8:04:08 GMT 1
Not a direct comparison, but I used this type of head stock bearing in all my C90 projects, purely based on cost. Never had any issue with them but not nearly as much weight or braking power to overload them…
I do have tapers in my 350 but the 250 came with a brand new set of balls so I used them without any adverse effect as yet.
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Post by abar121 on May 12, 2023 10:42:34 GMT 1
I'm going to try a combination of one of these, plus a taper bearing in a 4LO. To avoid the fitting issue with two tapers and the top cup sitting proud.
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ajh
Thrash Merchant
Posts: 415
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Post by ajh on May 12, 2023 18:45:40 GMT 1
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Post by JonW on May 13, 2023 1:46:01 GMT 1
I'm going to try a combination of one of these, plus a taper bearing in a 4LO. To avoid the fitting issue with two tapers and the top cup sitting proud. This isnt a bad compromise, for those worried about the height 'issue' (Im not seeing it as a huge issue so its in " lol) I assume you will taper the lowers and slap the balls on the top... er... you know what i mean   |
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