Lights
Rear light: if rack fitted then use Smart Superflash 0.5W (might need to get creative with 'P'-clips) or B&M (or similar) rack light, otherwise through bolt a suitable Cateye bracket to the upper rear of the seat (or use headrest if fitted) again with Smart 0.5W light.
Front: if Challenge fit a lighting tab next to the bottom bracket on the SL models then bolt something like a 16mm socket to it (M6 bolt + suitable washer) so you can attach a handlebar mounting front light to it (B&M Ixon IQ is nice but expensive, Trelock LS730 is nearly as good: both have sensible, i.e. not circular, beam shapes: get both from Germany on-line eg Roseversand). If no lighting tab then mounting a stem off the front mech post if fitted is one way, but if no front mech post then your on your own! IMHO you need the front light as far forward as possible to avoid 'foot flash'.
PM me if you'd like some bracket ideas.
+1: excellentCunobelin said:Deal with Radical Design directly, I have bought several items from them with brilliant service.
Rear light: if rack fitted then use Smart Superflash 0.5W (might need to get creative with 'P'-clips) or B&M (or similar) rack light, otherwise through bolt a suitable Cateye bracket to the upper rear of the seat (or use headrest if fitted) again with Smart 0.5W light.
Front: if Challenge fit a lighting tab next to the bottom bracket on the SL models then bolt something like a 16mm socket to it (M6 bolt + suitable washer) so you can attach a handlebar mounting front light to it (B&M Ixon IQ is nice but expensive, Trelock LS730 is nearly as good: both have sensible, i.e. not circular, beam shapes: get both from Germany on-line eg Roseversand). If no lighting tab then mounting a stem off the front mech post if fitted is one way, but if no front mech post then your on your own! IMHO you need the front light as far forward as possible to avoid 'foot flash'.
PM me if you'd like some bracket ideas.