What upgrade for your bike will make it FASTER LIGHTER & LAST LONGER?   The secret of top pros and only sold to the exclusive few in ultra high end equipment is now becoming available to the everyday racer/rider. SILICON NITRIDE BALL BEARINGS By replacing the loose steel ball bearings in compatible hubs and headsets you can gain most of the advantages of hybrid ceramic bearings which are all the rage in high end industry, aerospace, and auto racing. Hybrid ceramic bearings are bearings using ceramic balls with metallic outer rings, as apposed to full ceramic bearings which use ceramic races and balls at much higher price premiums. In most cases ceramic balls can replace the loose steel balls in compatible hubs and headsets. When fitted with the existing races you gain the benefits of a hybrid ceramic bearing at a very cost effective price.   Why are ceramic balls better than steel balls you ask? Weight            Silicon Nitride is 60 percent lighter than steel.          Result is less centrifugal force, faster rotational acceleration, resulting in reduced bearing wear. Surface finish Grade 5 Silicon Nitride balls spherical tolerance ±0.00013mm surface finish 0.000014Ra Grade 24 ultra high grade steel balls                  ±0.00060mm                      0.000040Ra.          Tighter tolerances and better surface finish result in reduced friction between balls and races. Hardness       Silicon Nitride is up to 2.5 times harder than bearing steel.          Result is Silicon Nitride balls retain their superior surface finish longer, extending bearing life.          Less deflection in the ball means less energy absorbed, therefore roller rolling resistance. (think tire pressures) No Rusting      Silicon Nitride does not oxidize or conduct electricity.          Result is Silicon Nitride balls retain their superior surface finish longer, extending bearing life, and races are less likely to rust thanks to less galvanic currents in the system.   What does this mean for you bike?   Lower rolling resistance Less weight Less maintenance More SPEED!   Currently a set of Silicon Nitride balls from a name brand retailer could cost you as much as $250USD   MULTI ITEM SALE In this listing you are able to order as many or as few of any mix of sizes up to the number still left under the Multi Item format. Each size costs the same, $1.00 per ball, and you can order any number for the same shipping cost. For instance: 60x5/32” = $60.00 (newer top end campy and Fulcrum adjustable hubs, Zonda, Eurus, Neutron, Hyperon, Bora, Fulcrum Racing 3, 1, zero, light, speed etc)   28x5/32” + 26x3/16” = $54 (7850 7801 wheel set)   22x3/16” + 18x1/4” = $40 (DA TRACK HB-7710, 6600 Ultegra hubs, 5600 105 hubs, WH-5600, WH-R561, WH-R550, WH-R500, M960 XTR, M760 XT etc)   22x3/16” + 34x5/32” = $56 (2007 WH-6600, WH-R601)   56x3/16” = $56 (7800 hub/wheel set)   52x3/16” = $52 (7800frt 7850rr hub set)   28x7/32” + 9x1/4” = $37 (older Campy hubs, check your hubs’ specs)   25x7/32”= $25 NANKAI BMX free coaster rear hub   52x3/32”=$52 (DA SPD) 48x3/32”=$48 (ALL OTHER SPD)  I have had customers confirm these are the correct numbers. The shimano tec docs quote the wrong quantities, but the drawings are correct.       After ordering your required volume email what sizes you require or include a comment in your paypal payment Check your service manual or competent bike mechanic for correct size(s) and ball numbers required for your application. Please email about other sizes and volumes. Sizes available now 3/32” 5/32” 3/16” 7/32” 1/4"     WHY BUY FROM ME? Happy customers from: United States, Germany, Italy, France, Australia, Canada, and England Numerous repeat customers (check my feedback) No suspect selling tactics Over 3000 ceramic balls sold this year!     KNOW WHAT YOU’RE BUYING! What I am selling are high grade finely finished ceramic ball bearings. Grade G5 refers to the standard of surface finish and roundness not just on one ball, but compares each ball to others manufactured at the same time. Higher the grade (lower the G#) the better the performance. Higher grades also cost much more to manufacture, and hence sell. Old adage, you get what you pay for. Don’t accept inferior quality!   Although Silicon Nitride balls will last longer than steel balls under similar conditions, correct fitment, lubrication and maintenance/inspection is still required. Consult a competent bike mechanic for the best practices for your application and for correct fitment and adjustment. Special grease/lube is not required, any high grade hub lube is recommended. The lower the viscosity the better, but service intervals may decrease. Results will vary due to hub/headset/pedal quality/condition and correct fitment and adjustment. If you are unsure about aspects of replacing the loose balls in your equipment consult a competent bike mechanic.