Breaking rear right wheel bearings

John Allen · 03-29-2024, 05:47 PM

A few weeks back my son came down hard from a jump on a trail with his 150cc Xpro Storm. Immediate clacking noise in the back wheel. I took into the shop a week ago tomorrow on Saturday and they were to fix that noise and put new new back brake pads on it

Called them Tuesday. Brakes were fixed, but stated they have put several wheel bearings in the back only to have the right side break after driving it a couple of minutes. This was after 2 more days of phone calls I am going over tomorrow to see what's up.

Anybody heard of a reason that wheel bearing would be under so much stress it would break in a very short time?

Megadan · 03-29-2024, 06:07 PM

Something is likely putting lateral load on the bearing. Either one or both races are not square with the other when everything is tightened down. Seeing as the bike was jumped, If the hub itself isn't somehow damaged I would suspect a bent or twisted swing arm. These bikes aren't really designed for leaving the earth.

severely · 03-29-2024, 06:53 PM

Does the spacer between the bearings exist? If it's not there you can have issues in a hurry. Over torquing?

Thumper · 03-29-2024, 08:07 PM

Spacer needs to be there to accept the torque of the Axel nut. AND, it needs to be the right length to prevent lateral torque on the inner race (as Megadan mentions).

If you have the rear axel assembled with the right spacer length and torque on the axel nut (50 foot lbs or so), the rear wheel should SPIN FREELY in neutral (on the stand). That is your test.

flopsweat · 03-30-2024, 08:21 AM

Quote:

Originally Posted by Megadan

These bikes aren't really designed for leaving the earth.

This is fantastic advice.

03-29-2024, 05:47 PM	#1
John Allen Join Date: Dec 2023 Posts: 3	Breaking rear right wheel bearings A few weeks back my son came down hard from a jump on a trail with his 150cc Xpro Storm. Immediate clacking noise in the back wheel. I took into the shop a week ago tomorrow on Saturday and they were to fix that noise and put new new back brake pads on it Called them Tuesday. Brakes were fixed, but stated they have put several wheel bearings in the back only to have the right side break after driving it a couple of minutes. This was after 2 more days of phone calls I am going over tomorrow to see what's up. Anybody heard of a reason that wheel bearing would be under so much stress it would break in a very short time?
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03-29-2024, 06:07 PM	#2
Megadan Join Date: Apr 2017 Location: Omaha, NE Posts: 7,976	Something is likely putting lateral load on the bearing. Either one or both races are not square with the other when everything is tightened down. Seeing as the bike was jumped, If the hub itself isn't somehow damaged I would suspect a bent or twisted swing arm. These bikes aren't really designed for leaving the earth. __________________ Hawk Information and Resource guide: http://www.chinariders.net/showthread.php?t=20331 2018 Hawk 250 - Full Mod list here. http://www.chinariders.net/showpost....62&postcount=1 2024 Royal Enfield Shotgun 650 https://chinariders.net/showthread.php?t=34124
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03-29-2024, 08:07 PM	#4
Thumper Join Date: Feb 2021 Location: Kansas City Posts: 2,237	Spacer needs to be there to accept the torque of the Axel nut. AND, it needs to be the right length to prevent lateral torque on the inner race (as Megadan mentions). If you have the rear axel assembled with the right spacer length and torque on the axel nut (50 foot lbs or so), the rear wheel should SPIN FREELY in neutral (on the stand). That is your test. __________________ -2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket -NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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03-29-2024, 06:53 PM	#3
severely Join Date: Oct 2021 Location: odessa MO; donna TX Posts: 149	Does the spacer between the bearings exist? If it's not there you can have issues in a hurry. Over torquing?
	1