Atlas rear wheel drive side (left) bearing

jms · Jun 15, 2025

Hi All,
Does anyone know if the rear drive side double row 5203K bearing needs to be angular on an Atlas? I’m replacing the bearings and see that some are angular and some are not. Thanks

bmepkid · Jun 15, 2025

jms said:
Hi All,
Does anyone know if the rear drive side double row 5203K bearing needs to be angular on an Atlas? I’m replacing the bearings and see that some are angular and some are not. Thanks

It's a 4203 and just a double row ball bearing.

jms · Jun 19, 2025

Thanks.
Looks like the 5203 bearing that I pulled out of there was the wrong bearing at least 1 mm wider. Now that I have everything apart and am waiting on delivery off new bearings, trying to wrap my head around how the wheel rotation actually works. It just seems to me that once the axle is fetched up tight that the distance piece that the bearings are attached to would be spinning on the axle. Must be that the distance piece is held in place via the dummy axle on one side and a several spacers and the speedo drive on the other?

jms · Jun 22, 2025

I've got new bearings installed. Can someone tell me if the left hand thread speedo drive is meant to be fully screwed in or left a bit out. The problem I am having is that when I install the speedo drive side bearing and drive it all of the way home in the hub this allows the speedo drive with its spacer to almost be screwed in all of the way. I then install the distance piece with the short leg ( facing the speedo drive) until it is all of the way home. The end result being that the brake side of the distance piece with the longer leg sticks out to far prohibiting the brake drum/sproket from seating on the hub properly. If I drift the distance piece in then it pushes the opposite bearing out to such an extent that the speedo drive is much further out than it should be in my opinion. Thoughts?

jms · Jun 22, 2025

jms said:
I've got new bearings installed. Can someone tell me if the left hand thread speedo drive is meant to be fully screwed in or left a bit out. The problem I am having is that when I install the speedo drive side bearing and drive it all of the way home in the hub this allows the speedo drive with its spacer to almost be screwed in all of the way. I then install the distance piece with the short leg ( facing the speedo drive) until it is all of the way home. The end result being that the brake side of the distance piece with the longer leg sticks out to far prohibiting the brake drum/sproket from seating on the hub properly. If I drift the distance piece in then it pushes the opposite bearing out to such an extent that the speedo drive is much further out than it should be in my opinion. Thoughts?

Could it be that the dummy axle that I have is dimensionally the wrong one? Did they ever change dimensions?

Atlas rear wheel drive side (left) bearing

jms

bmepkid

jms

jms

jms

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