81 WR430 frame vs 82CR250 frame

Any difference between them? Any advantages between one over the other??

Same

The cr frame has no upper frame loop that holds the rear fender. I’m not sure if the rake between the two is different. I can’t say for sure about the middle frame rail that’s centered under the engine case on the wr frame. I have no clue why some cut it out.

I have an incomplete 81 WR430 and a incomplete 82 CR250. I'm looking to put together a rider to do a few vintage Hare Scrambles and maybe light vintage MX, the later would be more just having fun, not serious racing. The CR is more complete as a chassis, although I have already had the Ohlins rebuilt from the WR.

I would eventually put both bikes back together correctly.

There are cheap affordable parts on eBay you just have to wait it out or post a wanted parts in the classified.

There is no difference in rake. Everything was 30.5 degrees from the 1978 OR to the change to 28.5 degrees in 1984 CR and WR

The only functional difference is the way the rear brake mounts. The WR/XC uses a non floating anchor on the swing arm, the CR uses a floating brake with the anchor point on the frame.

Why did they do that on the rear brakes.? The wr backplate support link is on the swingarm while the cr backplate link goes to the frame does that make sense? When the brake is on nothing is floating doesn’t the backplate hold the swingarm from swiveling on the cr.

http://www.racetech.com/page/title/Floating Brake Tech Tip

Theoretically floating brakes are better because they are isolated from suspension movement, but I prefer the non-floating Husky brakes.

Bill I really struggle to understand how you can have been through all the stuff you've done in your life yet not grasp a floating rear brake .
On the cr the plate rotates independently from the swing arm . Brake force is directed to the frame so the suspension can remain more active .
On a standard ( wr ) rear brake the force from the brake tries to rotate the whole swingarm downwards around the rear axle and tries to compress rear suspension .
The husky floating stuff is un popular because none of the lengths are the same and the brake pedal doesn't pivot on the same pivot so the pedal/engagement goes up n down with suspension

Do you ever google stuff before posting bill ? Like yea we all get excited and want to know stuff right now but does the Lil voice in your head ever say " hang on this is prolly quite basic and I bet I'm not the first person to ask this question so maybe I'll just google it " ?

On a standard ( wr ) rear brake the force from the brake tries to rotate the whole swingarm downwards around the rear axle and tries to compress rear suspension .
The husky floating stuff is un popular because none of the lengths are the same and the brake pedal doesn't pivot on the same pivot so the pedal/engagement goes up n down with suspension

I get it now.

The floating arms, early designs were not good for woods riding.
They were low and got bent or snapped off.

bastard to change a wheel in the scrub with a floating set up so wr is quicker change for enduro competition

Really Bill ???? CR brakes are unpopular ???? where do you come up with this $hit ???

Wow! wheres the Lol

Ask Charlie Rose

I'm pretty sure Bill was quoting someone else. Read back a lil.

Its No different to scrub change a CR over a WR ?? Bike down on right side, axle out, spacers out, lift wheel up leaving brake hub insitu. Reverse to install. Why is it harder ?

Because the XC/WR brake plate is anchored to the swing arm it does not move once the wheel is removed, the CR is free to flop around.