Bigger seat for a Roadster

Motorcycle seats are not over generous for room. The Roadster has the rider sitting quite forward. The only way would be to have one made or make one. The interstate seat base could be extended forward to meet a Roadster tank and made to tapper in to match. I have made a base to fit my bike with a Lyta tank on it. I altered an old rusty interstate base and moulded in fiber glass off of it. I used aftermarked stainless steet brackets and attached them to renforced steel blokes moulded in to the base.

The Roadster seat is about the same length as an Interstate seat but as it is mounted further forward you probably want to sit back a bit which restricts the pillions room.You could try borrowing an Interstate seat and trying it for size ignoring the gap at the front. I had a cafe race seat on a Triumph years ago (it was cheap) I made a padded bit to fill in the gap held on with terry clips.

At the moment I am using an old Interstate foam shaved down with a cheap Roadster cover on it all held to the base with velcro. This is the best for comfort out of three I have tried, but the right side is more comfortable that the left. Identical looking seats can be totally different when it comes to comfort.

I had the same issue with the length of the Roadster seat and found that the Interstate seat was a far better length to accommodate a pillion. I therefore got myself an Interstate seat cover and extended a Roadster seat steel pan to the Interstate seat length by adding (welding in) a section at the widest point, just behind the shock absorber mount. This is not as difficult as it may seem - make a cardboard template to get the shape of the section to be added, cut it from a sheet of suitable steeland then gently fold the edges. The resultant panel is then welded into the pan at the chosen point. The seat foam can be cut from a block or sheet of suitable foamobtained from an upholsterers using an electric carving knife to literally'carve' the required shape or the existing foam cut and a section let in. Again, making templates helps to keep it all symmetrical across the seat width. It is better if the foam is slightly too large so that the cover can be pulled tight to compress the foam slightly before the clips are applied.