1979 Honda XL500S – Frame 1
I had read on one of the thumper forums that replacing the XL swingarm with the FT one was possible with not too much hassle. The FT is wider at the mounting point and longer with the bottom shock mounts a little further back than the XL one. After a bit of measuring and cutting then a bit of grinding the FT swingarm fitted into the frame fine. Everything looks fine but the new shock mounting points, are further back with the longer swingarm. Because of this I have lost a bit of rear suspension travel but probably wont notice it too much as I’m not planning on doing any serious off road riding.
By using information from the All Balls chart and fork conversion tables – here – and physically measuring the stem, I was able to get a rough idea if the whole triple tree was ever going to work or not. The original XL forks were 35mm diameter and the CBR ones are 37mm so with the FT being close, it was just a matter of seeing which upper and lower bearings would need changed and how the stem would have to be adapted. The bearing numbers for ordering are the 99-XXXX-X ones.
|Upper fork tree||Lower fork tree|
|Fork size||Model||ID||OD||Width||Part No.||ID||OD||Width||Part No.|
Finally a bike is starting to take shape.