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derch

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Since: Aug 08, 2005
Posts: 29



(Msg. 1) Posted: Thu Dec 29, 2005 5:00 pm
Post subject: Rear Wheel Alignment Question
Archived from groups: rec>motorcycles>tech (more info?)
Hey All,
A round on me for the house!
I am in the process of building a bike. I am mocking the rear
wheel/brake/pulley setup and have a question. I am running a right
side drive 300 rear tire setup. I am also using a Hawg Halters drive
side brake/rotor. I believe I have the correct spacers selected and
when everything is assembled, including the drive belt, but not
tightened down the wheel spins freely. However, when I tighten down
the brake bracket, axle, and axle set screws the wheel no longer spins.
Is this normal? It doesn't seem right to me but I'm flying by the seat
of my pants. So I thought I should stop right here and ask the
experts. Any suggestions, with the exception of "You shouldn't be
buildin a bike!!!" would be greatly appreciated. Later.

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LJ1

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Since: Nov 24, 2003
Posts: 109



(Msg. 2) Posted: Thu Dec 29, 2005 10:27 pm
Post subject: Re: Rear Wheel Alignment Question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"derch" <rricciardi.TakeThisOut@cfl.rr.com> wrote in message
news:1135904456.376856.106390@o13g2000cwo.googlegroups.com...
> Hey All,
> A round on me for the house!
> I am in the process of building a bike. I am mocking the rear
> wheel/brake/pulley setup and have a question. I am running a right
> side drive 300 rear tire setup. I am also using a Hawg Halters drive
> side brake/rotor. I believe I have the correct spacers selected and
> when everything is assembled, including the drive belt, but not
> tightened down the wheel spins freely. However, when I tighten down
> the brake bracket, axle, and axle set screws the wheel no longer spins.
> Is this normal? It doesn't seem right to me but I'm flying by the seat
> of my pants. So I thought I should stop right here and ask the
> experts. Any suggestions, with the exception of "You shouldn't be
> buildin a bike!!!" would be greatly appreciated. Later.
>
I think we need a little more information starting with just how tight is
the wheel once you tighten everything up? There is normally some drag
between the discs and rotor but the wheel should turn relatively freely.
What happens if you don't have the brake pads in, does the wheel spin
freely? What is the spacing like between the pads and rotor (tight on both
sides/tight on one side gap on the other)? How about the spacing between the
rim and a fixed point on the frame on either side? Can you determine where
the friction is coming from?

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derch

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Since: Aug 08, 2005
Posts: 29



(Msg. 3) Posted: Fri Dec 30, 2005 7:28 am
Post subject: Re: Rear Wheel Alignment Question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
LJ wrote:
> >
> I think we need a little more information starting with just how tight is
> the wheel once you tighten everything up? There is normally some drag
> between the discs and rotor but the wheel should turn relatively freely.
> What happens if you don't have the brake pads in, does the wheel spin
> freely? What is the spacing like between the pads and rotor (tight on both
> sides/tight on one side gap on the other)? How about the spacing between the
> rim and a fixed point on the frame on either side? Can you determine where
> the friction is coming from?

Thanks for the reply LJ. It was bugging me so I went back into the
garage after I posted the question to take another look. It was hard
to see everything since there's so much in the way between the rotor,
pulley, and belt. But it looks like the rotor is not completed
centered in the caliper. It is rubbing on the inside of the caliper so
I can't shim it. I think I need to take out about a 1/16th of an inch
on the left side spacer and add it to the drive side spacer. So when
all is done and correct the wheel should spin fairly easily, right?
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CK

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Since: Nov 26, 2005
Posts: 78



(Msg. 4) Posted: Fri Dec 30, 2005 11:56 am
Post subject: Re: Rear Wheel Alignment Question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
derch wrote:

> But it looks like the rotor is not completed
> centered in the caliper. It is rubbing on the inside of the caliper so
> I can't shim it. I think I need to take out about a 1/16th of an inch
> on the left side spacer and add it to the drive side spacer. So when
> all is done and correct the wheel should spin fairly easily, right?

Maybe you don't need a spacer at all. Maybe one caliper piston is just
sticking further out of the bore than the other.

Crack the bleeder screws open and rock the caliper to retract the pads
and maybe
push the pads back a little more with a screwdriver. Close the
bleeders.

Spin the rear wheel to be sure the problem isn't the rear wheel
bearings binding.

Then pump the brake lever until the pads re-center themselves correctly.
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derch

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Since: Aug 08, 2005
Posts: 29



(Msg. 5) Posted: Sat Dec 31, 2005 12:06 pm
Post subject: Re: Rear Wheel Alignment Question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
CK wrote:
>
> Maybe you don't need a spacer at all. Maybe one caliper piston is just
> sticking further out of the bore than the other.
>
> Crack the bleeder screws open and rock the caliper to retract the pads
> and maybe
> push the pads back a little more with a screwdriver. Close the
> bleeders.
>
> Spin the rear wheel to be sure the problem isn't the rear wheel
> bearings binding.
>
> Then pump the brake lever until the pads re-center themselves correctly.

Hey CK. I am in the mock up phase so there is no fluid in the system
yet. I verified that the pads were fully open before I positioned the
caliper over the rotor. Also, everything spun fine prior to the
caliper being installed.
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