In the world of quick release seat post racks there appears to be only one that has 3 point attachment system.
Seatpost bike rack reviews.
To fit other racks to such bikes.
Upanbike 22lbs capacity mountain bike bicycle adjustable length rear rack quick release mounted at seatpost luggage carrier cargo 4 3 out of 5 stars 145 20 99 20.
Axiom dlx streamliner disc.
As for seatpost rack stability i ve found it depends on the attachment.
I d use a frame mounted rack if i could but the frame isn t set up for it.
If you are a mountain biker you definitely pick the seat post mounted rack as it will not interrupt you in your cycling session and will keep your tools or any other things safe.
If you need the panniers it s better to have the higher load capacity.
I replaced an older mountain bike with a similar seatpost rack but it used a quick release lever and shims which would not fit the large seatpost size of the new bike.
2 2 out of 5 5 reviews.
The market offers various types of racks.
The spx 1 fit just fine using 4 bolts and a rubber sleeve that makes for a solid no slip fit.
If your bike has mudguard eyelets but none on the seatstays a simple and elegant solution is to replace the seat clamp with one that s threaded for rack attachments.
Blackburn sp 1 seat post rack bike rack user reviews.
Anyway the biggest draw back to seatpost racks is the weight limit 20 to 30lbs as compared to 40 to 60lbs for a frame rack.
Upanbike 22lbs capacity mountain bike bicycle adjustable length rear rack quick release mounted at seatpost luggage carrier cargo 4 2 out of 5 stars 111 20 99 20.
You can also get racks that fit on the seatpost though these should only be used with very light loads as they tend to sway.
Most quick release beam seat post racks connect directly to the seat post.
I installed this rack on my new trek fuel full suspension bike.
The arkel randonneur seat post rack connects both to the seat post and to the seat rails making a strong 3 point connection.