andrew_s wrote:Be aware that that J82S carrier bracket is for 8 mm solid aluminium rod racks, like the original Blackburns.
Yes, one rack is such a Blackburn. But it gets more complicated still as two racks have a platform and one (a Nimrod) even has a slightly sloping upwards platform. One rack has an extra very narrow bar at the back. All are different, the only thing they have in common is a lack of fixing point for a lamp. So all the suggestions so far have potential depending on the rack.
I've also looked at using a stem on the seatpost and a longish alu bar to project the lamp outside of the rack area. I like this as it puts the light just where I would like it (clear and viewable on the outside) but the downside is that the stem turns the light on its side (the same as a front light). I haven't got round to resolving this yet (it is OK but not very attractive and some LEDs would point skywards).
These are mostly old racks acquired for different bikes over the years but I'm loath to switch racks over and I work on the basis that every bike has a rear rack. BTW I normally use panniers but there's often a rack top bag on there or a tent or some shopping so a rack light (or something else) is essential. If I were buying a rack now, the first thing i would look at is a light fitting point.
