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Discussion Starter · #1 · (Edited)
most of the bikes one sees here are equiped with the quad bearing opt. Apart from some "max" bearings why aren't there any roller bearing equiped bikes.
I'm no mecanical engineer but if the double "single bearing" gives better radial resistance and stiffens the lateral movement quite a bit, shouldn't an appropriate roller bearing do a better job?

I'm probably missing something, so please explain.

ps: it's to keep the Ventana Forum living :)
 

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Discussion Starter · #2 ·
Don't we have any Mecanical Engineers on this forum?

Sherwood, had you looked at this before? Maybe this is completly nonsense but please explain. I like learning.

Where's UKTMonster?
 

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moclan said:
Don't we have any Mecanical Engineers on this forum?

Sherwood, had you looked at this before? Maybe this is completly nonsense but please explain. I like learning.

Where's UKTMonster?
UKtrailmonster is testing the new F1 cars at the moment. The only experience I have had with needle roller bearings on bike frames is with the Turner DHR. They dont seem to give any extra advantage over the ball type bearing in terms of durability and I would imagine that the range available is restrictive to the frame builders. They are a right pain to remove if the bearing fails because the outer shell is easily damaged and seems thinner when compared to a ball type bearing outer race. I would imagine they are harder to seal from the outside elements.
What part of France are you in ?
 

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Discussion Starter · #4 ·
ajr said:
UKtrailmonster is testing the new F1 cars at the moment. The only experience I have had with needle roller bearings on bike frames is with the Turner DHR. They dont seem to give any extra advantage over the ball type bearing in terms of durability and I would imagine that the range available is restrictive to the frame builders. They are a right pain to remove if the bearing fails because the outer shell is easily damaged and seems thinner when compared to a ball type bearing outer race. I would imagine they are harder to seal from the outside elements.
What part of France are you in ?
Thanks ajr, I've read (recently) that roller bearings aren't as strongh lateraly as say roller bearings unless they are tapered so in fact double ball bearings are probably the best solution. I was thinking of something bigger than needle ones.

I live right by (20' drive) Disney, in the Seine et Marne. About 40' from east of Paris
I'm coming over to Cambridge end of March, I'll have to get my wife to accept a slight detour by your place
 

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ajr said:
UKtrailmonster is testing the new F1 cars at the moment. The only experience I have had with needle roller bearings on bike frames is with the Turner DHR. They dont seem to give any extra advantage over the ball type bearing in terms of durability and I would imagine that the range available is restrictive to the frame builders. They are a right pain to remove if the bearing fails because the outer shell is easily damaged and seems thinner when compared to a ball type bearing outer race. I would imagine they are harder to seal from the outside elements.
What part of France are you in ?
Yes, I'm busy testing in Spain, but I still have a quick look at the forum when I'm missing my Ventana!

Needle roller bearings are a good option if radial space is tight and I've used them successfully on all sorts of bellcranks and suspension joints. They spread the load better than ball bearings, but their friction is a little higher. You can also get combination needle/thrust bearings, which I think would work very well. The outer race is a top-hat pressing with a built in roller thrust bearing on one end of the needle bearing. Nadella used to make some really lightweight ones that were very popular in motorsport for suspension bellcranks and anti-roll-bar mounts. They would be perfect for the rocker frame mount and main pivot.

Anyway, back to testing again :)
 

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moclan said:
Thanks ajr, I've read (recently) that roller bearings aren't as strongh lateraly as say roller bearings unless they are tapered so in fact double ball bearings are probably the best solution. I was thinking of something bigger than needle ones.

I live right by (20' drive) Disney, in the Seine et Marne. About 40' from east of Paris
I'm coming over to Cambridge end of March, I'll have to get my wife to accept a slight detour by your place
It would be good to meet you. If you can find the time I can lend you a bike and and you could ride while you are here.
 

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uktrailmonster said:
Yes, I'm busy testing in Spain, but I still have a quick look at the forum when I'm missing my Ventana!

Needle roller bearings are a good option if radial space is tight and I've used them successfully on all sorts of bellcranks and suspension joints. They spread the load better than ball bearings, but their friction is a little higher. You can also get combination needle/thrust bearings, which I think would work very well. The outer race is a top-hat pressing with a built in roller thrust bearing on one end of the needle bearing. Nadella used to make some really lightweight ones that were very popular in motorsport for suspension bellcranks and anti-roll-bar mounts. They would be perfect for the rocker frame mount and main pivot.

Anyway, back to testing again :)
Hi Pete. Its a hard life. See you Sunday.
 

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Pictures, pictures!

uktrailmonster said:
Yes, I'm busy testing in Spain, but I still have a quick look at the forum when I'm missing my Ventana!
Yeah well I'm driving my 96 Toyota down to my Mom's house. :p
 

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Discussion Starter · #10 ·
ajr said:
It would be good to meet you. If you can find the time I can lend you a bike and and you could ride while you are here.
Now that's nice! I might look you up and test one of your bikes for an hour or so. My wife seemed interested too (if we can lose the kids for a few hours :p )
If I can make I'll give you a call.
 
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