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The Schwinn Meridian Trikes use a different type of axle than others such as Sun Bicycle Trikes. The center of Schwinn & Sun Trikes are the same and measured diameter at 17mm, but differ on the threaded ends... Sun Trikes continue with 17mm to the axle ends, but Schwinn Trikes taper down to 12.5mm axle ends to fit their custom size wheels. This Schwinn tapered reduction in axle diameter may be part of the reason why Schwinn axles seem to bend or break more easily.
It seems that Schwinn requested these custom parts size to lock consumers into having to purchase solely high-priced Schwinn wheel/axle parts.
As of 2022, buying replacement Schwinn Wheel/Axle replacement parts is a real pain because Schwinn will not sell direct to consumers, will not disclose Schwinn part numbers, and Schwinn Customer Service tries to redirect public parts inquiries to "authorized dealers".
The problem is most local bike stores no longer carry Schwinn bikes or parts and the retailer "big-box" stores such as Walmart, Target, or Dick's Sporting Goods will only sell Schwinn parts for bikes they stock or have sold to you at that store.
After complaining, to Schwinn Customer Service several times, they finally allowed me to order direct from Schwinn.
screw 1 of the cone pieces(that fit bearings)tapered section towards centre of axle(about 3/4 inch), then slip 1 bearing case on axle from other end with bearing side facing centre. Then insert axle into hub and put bearing on other end(bearings facing middle)then cone. **NOTE** Put small amount of bearing grease inside hub for bearings. Doesn't have to be bicycle grease- I use auto grease as you get 10times as much for same price. Then adjust cones by hand untill there isn't any slack and axle centered.Then screw on thin nut(both ends), it acts as lock nut for cones.To tighten correctly you need a skinny spanner to hold cone while you tighten the skinny nut. Spanners from bike shop only cost about $2. Can adjust without a narrow head spanner by leaving a bit of slack when doing up cones and hopefully lock effect between cone/nut grabs before cones are over tight(a bit of messing around without a narrow spanner). There shouldn't be any slack between axle/cones and wheel, wheel should spin freely. Put wheel on bike then a washer(if you have any)outside frame, then larger wheel nuts. Hopefully all your pieces have been used. HAPPY RIDING
Why not call a Schwinn dealer and ask if they can order it for you? You do realize that you void any warranty by altering you bike, don't you? But, if you don't care, look on the www.schwinn.com website and find a Schwinn dealer near you.
The set screws in the center of the axle are there to keep the axle centered in the frame. Only the right wheel is powered which also means only the right wheel brakes when operating the rear brake. This is because the rear wheels must be able to spin independently when turning because the outside wheel will move faster. Unfortunately no one builds differentials at this price.
If you have wheel wobble you need to determine if the axle is bent or the wheel is not true. Prop up the rear of the bike on a stand and remove the problematic wheel. Manually pedal the bike and check the axle as it spins. If the axle is wobbling then it is bent and will need to be replaced. If it spins true then the wheel is the culprit.
The axle is relatively inexpensive and can be ordered through a Schwinn dealer. Any bike shop should be able to true a wheel for around $15-$20.
you need a new axle kit, and a cog removal tool. They used to be a Huret dearailleur if I remember right. I know a varsity never had Shimano. I think you may be better off buying a new rear wheel (it is usually less money than having to rebuild the axle) and let the bike shop do the change over, it is well worth it. You wont have to deal with the brakes,check the cones etc. Why did you have the Meridian adult trike on, and you have an old 10 speed Varsity? Kind of confusing.
The bikes are pre-assembled by a machine that overtightens the rear axle. I had the same problem with my daugher's 12 inch huffy princess bike and my other duaghter's 16 inch Schwinn bike. If you loosen the nuts on the back axle it fixes the problem. I have read that the idea thing for these bike is to have them re-assembled and re-lubricated by a bike shop, but I thought this might cost as much as I paid for the bike.
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