what is the difference between a ball bearing and a regular ceramic pulley?
819931
The ball bearing uses a small rolling bearing and are normally after market. The Shimon RD6700 (Ultegra Pullies) have very good quality ceramic sleeve bearing that is better at resisting water and dirt.
819932
Friction. Differences are minuscule though (1.3W between best & worst tested see link below) - a good chain lube can provide 9+ watts... to help provide perspective.All you ever wanted to know here: http://www.friction-facts.com/test-results/individual-reports/derailleur-pulley-efficiency-test
819933
one uses ball bearings in the 'race' to allow the piece to rotate and the other uses a ceramic, cylindrical piece as the 'bearing'. Most feel the ceramic bearing is better. i.e., offers less frictional resistance to turning.
819934
Friction. Differences are minuscule though (1.3W between best & worst tested see link below) - a good chain lube can provide 9+ watts... to help provide perspective. All you ever wanted to know here: http://www.friction-facts.com/test-results/individual-reports/derailleur-pulley-efficiency-test
819935
I am not an expert by any means, but I believe the ceramic rotates much smoother than the metal traditional bearings. Which in turn, gives you a better pedal experience. If I am right about this whole thing, the ceramic pulleys spin wonderfully (less friction) compared to the metal. Hope this helps. Hope I am right about this, but honestly, I could be wrong.
667113
I have had it more than a year brilliant machine. Pulley needs lubrication occasionally. I use at least twice a week and have lubricated only once.
955910
the pullies are steel bearings and raceway with a plasric wheel. the frame is tube steel. after 4 yrs of use I have never had an issue with any of the moving parts
2216930
Inspect the flywheel where the nut seats in a cylindrical recess. After removing the nut if you inspect the recess you will see it has inside threads. The puller screws into these. The center bolt and shaft protector pull up on the shaft. Mine measures 1.5 in. for the flywheel recess. You need good quality tools and perhaps extensions but the tool works well.
342030
It does not matter from which material pulley made off. So metal would work just as good as plastic as long as you doing exercise.
1155808
This is food grade grease, designed for gears and slides...I don't think they are the same thing.
2167285
I am not sure as I gave it as a gift and didn't notice what type of balls were used. Hardware stores would have them if they are small steel balls.
348686
the bg10 has two motors one for sucking up the formula and one for the rollers. The 86t3 only has one motor doing both properties of the machine. I bought the bg10 for this reason.
450055
Belt drive is for commercial when machine is going to run several hours a day , For home owner or contractor small business would never know the difference , belt drive is a bigger pump running slower removed from heat and vibration of engine keeps pump cool by removing it from engine and pump use pulley to run 1350 RPM direct drive runs 17-18 hundred RPM.
1938877
The drill with bigger head is regular drill the other is impact drill.impact drives screws faster this is a great set
1731319
it is not a ball bearing, but just a collar of metal that the shaft/axial goes into and rotates inside of
1163798
It is a ball bearing. I don't know the difference myself but just know this works for our two toy Schnauzers. Hope this helps.
2084306
The ball bearings are ceramic but the races are steel. Fortunately there is no metal to metal contact, thus no chance of rust. These are extremely fast!!!! Very smooth, and impeccably quiet!
1259601
The pulley is probably the same. How its connected would be the issue. If it was me I would stick with shimano parts.
1888025
I couldn't visually see much difference both looked and felt the same-heavy ceramic. The Doulton was much cheaper and seems to fit and work fine. I couldn't say if one lasts longer than the other-we typically stretch the recommended interval since they are pretty expensive to replace every year, although I'm sure your mileage may vary depending on how much you use it. Good Luck
1891244
I've used both, it has more torque at the lower settings but is also heavier and gets hot faster.
1058610
Yes, like Tri said, it has one less ball bearing. It's pretty much the same otherwise. :)