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Author Topic: rear wheel drag  (Read 3290 times)

kneeslider

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Re: rear wheel drag
« Reply #15 on: September 19, 2016, 10:23:29 AM »
Anyone noticed that the resistance changes as you turn the rear wheel?
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mrbios

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Re: rear wheel drag
« Reply #16 on: September 19, 2016, 05:58:25 PM »
Quote from: CROSSBOLT on May 21, 2016, 05:55:12 PM
...rear brake always dragged especially after using it and it would be a bit hot. New DT300i does NOT drag at all. What's the difference?

Karl

Always wondered about this myself.  Every motorcycle, scooter that I have ever owned has a rear disc that gets "warm" even if you drive a few miles and only apply the front brake to stop the rear will be a little bit warm from drag.  I've lubed the sliders, no change.

Regarding wheel drag - if you truly want to eliminate caliper drag you could unbolt it (but leave the brake line connected) then spin the wheel.  Drag comes from the belt which is always touching the rear pulley.  People expect the rear to spin like a bicycle and are surprised by all the drag.

This video or numerous others will show you what is going on:

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PaulC

CROSSBOLT

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Re: rear wheel drag
« Reply #17 on: September 19, 2016, 09:38:38 PM »
There is quite a bit of gear drag from the final reduction unit but no belt friction since the clutch bell is the only thing turning when back wheel is spun by hand. The belt turns the clutch assembly which is disconnected from the bell.

Karl
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Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
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mrbios

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Re: rear wheel drag
« Reply #18 on: September 19, 2016, 10:02:28 PM »
Quote from: CROSSBOLT on September 19, 2016, 09:38:38 PM
There is quite a bit of gear drag from the final reduction unit but no belt friction since the clutch bell is the only thing turning when back wheel is spun by hand. The belt turns the clutch assembly which is disconnected from the bell.

Karl

Good point I forgot about that.  Because rear wheel spins the gears in the differential.
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PaulC

kneeslider

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Re: rear wheel drag
« Reply #19 on: September 24, 2016, 10:59:36 AM »
Today I changed my gear fluid with REDLINE Gear Oil.

Immediately the dragging disappeared.  So it might be food for thought next time you discover a dragging rear wheel.

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Stig / Major Tom

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Re: rear wheel drag
« Reply #20 on: September 25, 2016, 03:25:19 PM »
Quote from: kneeslider on September 24, 2016, 10:59:36 AM
Today I changed my gear fluid with REDLINE Gear Oil.

Immediately the dragging disappeared.  So it might be food for thought next time you discover a dragging rear wheel.


I used that stuff years ago in my VW Bus's trans-axle......made for much easier shifting when starting out on very, very, cold mornings in a Mid Western winter. Had to think it was good for the gears, too.
Stig
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And, I'm feeling a little peculiar.

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