I've been looking at the exact same modification myself. I know the disc diameter is different. Other variables are the axle diameter and swingarm to hub spacing. Please keep us up to speed on how you make out.Does anyone know if the Scrambler rear hub is the same spec as the America rear hub? I'm using a modified America caliper bracket to move the Scrambler break topside, but the disc from the America is larger than the OEM Scrambler disc. Before I keep going along this road, I'm wondering if I'm wasting my time.
What I've learned so far: a 2002 America caliper mount fits the axle diameter on the Scrambler and seems to mount just fine on the swingarm. It is too wide for the swingarm/hub spacing, but thanks to its design you can grind 3mm (approx.) off the back so that it is the same thickness as the Scrambler caliper mount. The Scrambler caliper will mount to the America caliper mount, but the stock cable may be a challenge. The biggest stumbling point is the disc - or maybe not - I'm a newbie, so I'm flying by the seat of my pants.I've been looking at the exact same modification myself. I know the disc diameter is different. Other variables are the axle diameter and swingarm to hub spacing. Please keep us up to speed on how you make out.
I replied on the ADV site too, but here goes.
The America bracket fits the Scrambler swing arm, and the (Scrambler) caliper bolts on fine like you said. But, the America disc is a 285 and the Scrambler is a 255. So, the fits no good without a new disc, or modifying the (America) bracket. The America disc looks like it bolts to the hub with 5 bolts, whereas the Scrambler has 4. So you'd have to find a 285 disc with the 4 bolt mount for the Scrambler hub. A new disc would probably be expensive. I didn't look into that because that ruins doing it cheap.
I don't think I would be able to make the appropriate modifications to the bracket without butchering it. You'd have to re-drill the caliper mounts lower and machine/grind off the excess material.
Then, the caliper sits on the very top of the disc like it does on the America instead of on the front side (below) like it does on the Scrambler. And I'm thinking you'd have to get a longer brake line to fit, but maybe not.
I'm real interested in doing this myself. I almost bought an America caliper to see if there was enough material there to modify the mount so the (Scrambler) caliper could be fit to the front side of the stock disc. Basically mirror the stock Scrambler one that is obviously on the wrong side. Then, hopefully you could still run the stock disc, caliper and brake line. If there is enough "extra" material that you could mirror the stock one, I bet you could find a machine shop to drill and cut for you pretty cheaply.
Let us know how you make out. I'm interested also.
Heh, your wife and my wife cold probably fill up their own forum on their husbands to-do-for-the-bike-list.Let us know if you find one. I'll put it on my to-do-for-the-bike list according to expense. My wife loves this list. Sorry, LOATHES.
EBC makes good brake products but they explicitly state they will not help you find products to fit your bike. So I'm not real sure honestly to go about finding a 285mm disc with four holes. Good luck.