Hi,
I have standard 4 spoke wheels and the rear has the (unused) splined inner hub (Dia. 50mm, ID 45mm). Was this wheel also used on other models or is there a chance I have a non-std FD that has a 25mm un-splined ‘stub’?

They're all the same, but dunno what other bikes theye were destined for.

Dai wrote:They're all the same, but dunno what other bikes theye were destined for.

Cool. I must have had that wheel off a half dozen times and hadn’t previously registered the splines. Must try harder.

The Y-spoke 2.5x17 was only used on K75 and K100s.

Is this what you mean by splined?

It is Mr D, I suppose ribbed would be a better term. I was just curious about the seeming redundancy really.

Some R bikes of the era also had Y-spoked wheels. The front wheels were the same but not the rear.  I don't know if the R bikes ever had a disc brake Y-spoke rear wheel.

duck wrote:Some R bikes of the era also had Y-spoked wheels. The front wheels were the same but not the rear.  I don't know if the R bikes ever had a disc brake Y-spoke rear wheel.

The front brake calipers are the same too, but handed because they swapped from in front of the forks to behind.

FYI: Airheads with Monolever swingarms use only a drum brake at the rear. The last disc brake rear Airheads were some of the dual shock S, RS & RT models. 

The K75 drum brake model rear wheel doesn't fit the Monolever Airheads due to an extreme offset. I attempted to install one on a single shock Airhead bike I was putting together back in '08. No go.

As for the 'splines' of Y spoke wheels, sadly they appear to have real job in life.

Two Wheels Better wrote:As for the 'splines' of Y spoke wheels, sadly they appear to have real job in life.

Go on I’ll bite. What is the ‘real’ job they perform?

Maybe they're there to hold in that little black plastic hub cap.

My mind typed the word 'no' as in no real job but my fingers apparently didn't listen. Doh!

Two Wheels Better wrote:My mind typed the word 'no' as in no real job but my fingers apparently didn't listen. Doh!

I hope you’re not a careers advisor 

There are some subtle differences between the Y wheels on the R & K bikes.  I have a 95 R100RT and a 1986 K100Rt. A friend of mine tired to fit a front brake disk off of a K100 onto a R100 of the same vintage as mine.  It mounted up but it wouldn't fit the rotor.  You would have had to space the rotor to get it to fit.

The R bikes took a 90 tire and the K bikes took a 100 tire on the front, so maybe that had something to do with it.  Also not sure if the forks where the same diameter.

If I ever decide to move the sidecar from my R bike to my K bike, I was going to check if I could just swap the whole front ends as my R sidecar bike has a leading link front end on it.  Someday maybe I'll take some measurements.

The front Y wheels on the Ks and Rs are the same part - 36311451897.

But the brake rotors are different. For example, rotor 34111457386 was only used on Ks.

duck wrote:The front Y wheels on the Ks and Rs are the same part - 36311451897.

But the brake rotors are different. For example, rotor 34111457386 was only used on Ks.

I believe the calipers and the brake disk's are different between the two bikes, as a front disk off a K wouldn't fit on the fellows R100RT ( late model ). So If I was doing a front end swap between an R & K I'd have to swap everything brake related.

Calipers are the same too - 34112310309 & 34112310310.

The rotors are probably different because the R forks had them spaced out from the wheel differently.