Adapter, Bontrager Blendr saddle to Topeak bag

Some Bontrager saddles feature 2 M5 tapped holes, which is nice for mounting all sorts of things. Here is Bontrager…
1h 32m
1× print file
0.30 mm
0.40 mm
14.00 g
3
20
0
511
updated July 13, 2022

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Some Bontrager saddles feature 2 M5 tapped holes, which is nice for mounting all sorts of things.

Here is Bontrager Blendr Saddle Accessory Mount which uses these hardpoints.

I have a Topeak saddle bag which I wanted to mount. Because I use a non-offset seatpost & my saddle is largely slid forward, it typically wouldn't mount anyways because the front of the bag would interfere with the back of the seatpost.

However, I can solve both problems at once:

  • the bag mount is offset to the rear by almost 40-50 mm from the stock mount (this offset turned out to be perfect on the first try)
  • the 2-bolt pattern allows me to circumvent the original Topeak adapter entirely

Note that this print is effectively supporting the weight of the bag & all its contents, so it should be printed for more strength.

As a bonus, I sandwiched a piece of plastic salvaged from a push lawnmower clippings bag as a fender. I used a zip tie to force a curve in the plastic in order to stiffen it against drooping into my rear wheel. I simply drilled M5 clearance holes in the plastic. It's a better solution than the Ass Savers you can buy.

First revision

Note also that I needed to sand the slanted face of the mount down to get the clip to engage. I think the slot also needs to be a bit larger. It's tight now, but with repeated use I trust it will get looser. Until then, the tightness improves security of the bag mount.

Second revision improvements

I've loosened the slots a bit in my fifth revision (second Solidworks revision), also posted.

This version is untested.

Category: Other

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