Sidecar Racing

**Drew** · 21st March 2016, 17:57

Originally Posted by merv

Great effort mate and I see Kick has asked too, what does that bit about the caliper mount moving mean and why couldn't you move it back?

Should have mentioned, we also managed third place over all.

The caliper mounting bracket pivots around the axle through a bearing. The bearing is a snug fit but we didn't locate it thinking this way it would find its own home side to side. Seems that through whatever flex the front end has though, it wants to wander to the outside. So we'll put a couple grooves in the spacer that the bearing slides over, and locate it with a couple circlips.

Problem solved.

Slightly gutted we couldn't keep running and battle for the outright win, but it was a super awesome weekend anyway.

**Grumph** · 21st March 2016, 19:01

Originally Posted by Drew

Should have mentioned, we also managed third place over all.

The caliper mounting bracket pivots around the axle through a bearing. The bearing is a snug fit but we didn't locate it thinking this way it would find its own home side to side. Seems that through whatever flex the front end has though, it wants to wander to the outside. So we'll put a couple grooves in the spacer that the bearing slides over, and locate it with a couple circlips.

Well done.
If the caliper wants to move across - out of nominal correct alignment - I see two possible reasons, both should at least be looked at IMO.
One - you've got uneven caliper piston movement - have a look at the seals and that pistons move freely.
Two - your bearing ain't dead square to the caliper mounting bracket. This can develop enough force to move any circlip...

i've had a similar problem on the rear of a big postie giving uneven pad wear. In that case i just tightened up the clearances and floated it less.
As an aside the rider of that one likes using the rear to help back it in - and hold the wheelies down...

**merv** · 21st March 2016, 19:01

Thanks Drew that explains it and it was a lateral positioning you were talking about. As for 3rd yeah a win would have been nice but could you have beaten that fast bloke?

**Drew** · 21st March 2016, 19:08

Originally Posted by merv

Thanks Drew that explains it and it was a lateral positioning you were talking about. As for 3rd yeah a win would have been nice but could you have beaten that fast bloke?

We could have beaten the guy who led all weekend. Jay wasn't gonna do his burlingame act if we led it.

**Drew** · 21st March 2016, 19:14

Originally Posted by Grumph

Well done.
If the caliper wants to move across - out of nominal correct alignment - I see two possible reasons, both should at least be looked at IMO.
One - you've got uneven caliper piston movement - have a look at the seals and that pistons move freely.
Two - your bearing ain't dead square to the caliper mounting bracket. This can develop enough force to move any circlip...

i've had a similar problem on the rear of a big postie giving uneven pad wear. In that case i just tightened up the clearances and floated it less.
As an aside the rider of that one likes using the rear to help back it in - and hold the wheelies down...

Piston movement is free and easy on all four pots.

But I'll check that the bearing is square to the axle. Cheers.

Mounting plate is getting replaced anyway. We couldn't match the last disk that was on the front, so we got a pair of disks that we 10mm bigger diameter but identical in every other way. So since this needs sorting, well move the caliper 10mm further out and then the rotor is an easily sourced off the shelf part...which the next owner should appreciate.

**Grumph** · 21st March 2016, 19:35

this is what i finished up with on the postie. Stainless spacer through the center, alloy mount plate with bronze bush running on the spacer.
trapped in place between the wheel bearing on the inner end and the flange on the outer.

**Drew** · 21st March 2016, 20:54

Originally Posted by Grumph

this is what i finished up with on the postie. Stainless spacer through the center, alloy mount plate with bronze bush running on the spacer.
trapped in place between the wheel bearing on the inner end and the flange on the outer.

Makes ours look positively under engineered. Though the only sign of any issue is that the bearing has moved slightly. With the enormous four pot on there twisting of the caliper under brakes seems unlikely, and the pad wear backs that up. So my best guess is that because ya can't brake as deep into left turns o a chair, that the swingarm flex under brakes into right hand turns means it gets further and further off center to that side in small increments.

From your advice instead of two circlips, we'll step the spacer and use a circlip on the inside where it doesn't want to move toward.

**scrivy** · 22nd March 2016, 07:37

Originally Posted by Drew

So my best guess is that because ya can't brake as deep into left turns on a chair,

Ya what???
Who says that??

Without a doubt I would brake harder into lefts than rights.....

Turn 1 Ruapuna, turn 2 Eastern Creek, turn 5 HD, as a starter....

**Drew** · 22nd March 2016, 07:52

Originally Posted by scrivy

Ya what???
Who says that??

Without a doubt I would brake harder into lefts than rights.....

Turn 1 Ruapuna, turn 2 Eastern Creek, turn 5 HD, as a starter....

If I carry the brake past turn in to the left, it pitches the chair wheel hard enough to throw Alan off.

**swarfie** · 22nd March 2016, 07:58

Originally Posted by Drew

If I carry the brake past turn in to the left, it pitches the chair wheel hard enough to throw Alan off.

Turn latter ya wimp

**Drew** · 22nd March 2016, 07:59

Originally Posted by swarfie

Turn latter ya wimp

Can't gas through the apex if I go in that hot. Honestly, some of you guys should ride our thing at HAGD. By the sounds of things it's more of a handful than it should be.

**scrivy** · 22nd March 2016, 08:04

Originally Posted by Drew

Can't gas through the apex if I go in that hot. Honestly, some of you guys should ride our thing at HAGD. By the sounds of things it's more of a handful than it should be.

Yes please.......

Get Al to eat more pies..... Probably why I dont have probs entering lefts......

**roogazza** · 22nd March 2016, 08:42

Originally Posted by Drew

Can't gas through the apex if I go in that hot. Honestly, some of you guys should ride our thing at HAGD. By the sounds of things it's more of a handful than it should be.

It sounds lethal and you take it up the cliffdangler thingy ? I take it thats where you mean ?
I clicked,no results up on their site yet.
Fastest man up there, still Andrew Lawrence's boy (man ) ?