Re-torque wheel nuts after 100km - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 7 (permalink) Old 05-22-2019, 11:54 PM Thread Starter
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Re-torque wheel nuts after 100km

today I got new tires (Dunlop Roadsmart3) installed on my FJR at the local dealer, and I am wondering why is that the Bike shop doesn't think it is necessary to re-torque and/or check bike wheel nuts and pinch bolts after approx 100km. Every time I get wheels re-installed on my cars the shop will always ask me to come back after 100km to re-torque and check the wheel nuts.
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post #2 of 7 (permalink) Old 05-23-2019, 12:32 AM
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Well, when changing tires I've never found my FJR bolts to be anything other than where I left them last time I changed tires. If it bothers you then learning to check the bolts yourself would be a good start toward a motorcycle rider's education. Don't worry about the exact torque, just worry whether the fasteners are loose. Is easy to get some too tight such as the pinch bolts.

Lugnuts/lug bolts on cars are loaded differently. Exposed to heating/cooling cycles from the brakes which motorcycles do not.
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post #3 of 7 (permalink) Old 05-23-2019, 01:26 AM
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If it makesyou feel better, learn to check them yourself. Unless you live right next door to your shop, you can check them quicker yourself than taking the bike into the shop. .
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post #4 of 7 (permalink) Old 05-23-2019, 01:34 AM
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Wheel studs/nuts on vehicles are also used to transfer positive and negative acceleration forces to/from the wheel to/from the hub - very very different to the forces applied to the wheel and axle retention mechanism on an FJR.
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post #5 of 7 (permalink) Old 05-23-2019, 09:52 AM
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Quote:
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Wheel studs/nuts on vehicles are also used to transfer positive and negative acceleration forces to/from the wheel to/from the hub - very very different to the forces applied to the wheel and axle retention mechanism on an FJR.
Yes, the motorcycle axle carries the load, the nut and pinch bolts only serve to keep the axle in place, doesn't carry the vehicle's load. Unlike an automobile the threads do not directly carry the vehicle's load.

For example on the front the left axle bolt only serves to snug the bearings. The pinch bolts grip the axle and serve to maintain spacing between the fork legs. Arguably, this bolt does almost nothing once the pinch bolts are tightened.

On the rear the axle nut primarily serves to snug the bearings and keep wheel in contact with drive gears. The pinch bolt on the right serves much the same as pinch bolts on front, keeps the swingarm spacing. On both ends there is about 1/8" wiggle room the right fork or right swingarm could be clamped.
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post #6 of 7 (permalink) Old 05-23-2019, 11:54 PM Thread Starter
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Quote:
Originally Posted by JohnC View Post
If it makesyou feel better, learn to check them yourself. Unless you live right next door to your shop, you can check them quicker yourself than taking the bike into the shop. .
I know how to use mu wrenches Thank you, just wondering why different requirements for bikes
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post #7 of 7 (permalink) Old 05-24-2019, 01:56 AM
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There are specially two things which makes them very different.


1. The bolt on a bike (FJR) is mouted in a fork, where the bolt is only keeping things togehter and take some share load. On a car (as mentioned above) the bolts might see additional load during acceleration and braking, at least if they are not correctly and equally tightened. To ensure they are equally, I always tighten the bolts in a cross pattern x 3 times. Many workshops does it only one time, and tightening one bolt reduces the torque on the bolt next to it.



2. The second thing and the most important is the lenght of the bolts. The long bolts on a bike are streched a lot more than the short bolts on a car, which will prevent the nut from coming loose. This is a very important thing, and to acheive sufficient tension, this is why using the correct tigthening torque for these bolts is so important. I know many dont't, but I use a torque wrench to make no mistake. Short bolts torque is also important, but due to the short stretch, they are a lot more exposeed to come loose because of pulsing load and viberations.


They simply cannot be compared.





/rogerf
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Last edited by rogerf; 05-24-2019 at 02:24 AM.
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