Fat Bike Rear Rack
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Heavy duty (mostly printed) rear rack for a Trek Fat Bike.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Outdoor Sports
- Licencja
- Creative Commons — Attribution — Noncommercial
I wanted a heavy duty rack for my Trek Fat Bike. This particular bike doesn't have any attachment points in the rear, so I added an extra long axle to allow the rack to attach directly to the extended axle. (strength-wise, the best place attach) This bike also has a dropper seat post so my design attaches low on the fixed portion of the dropper.
I prototype in PETG and final prints were in Kingroon carbon fiber reinforced PETG. This is the first time I have used Kingroon filament and it printed great.
This design is specific to a fat bike (27.5"x4.5" tires). I included the F360 files in case anyone wants to adapt this for other size bikes. I designed for 3/8" aluminum rods which is overkill if you only carry light to moderately heavy loads. I used some cutting board material (HPDE) for the flat rack and added a lot of holes for straps and future insert points. Wood or al extrusion could easily substitute for this piece.
Printed parts
BikeAxleNutTool - Optional part for my extended axle nuts.
Seatpost Clamp - resize diameter as needed for your seat post. Press in M5 insert to thick side.
Top Support - Print 2 and press two M4 inserts into each. This could be shortened for non-fat bikes.
Seat Post Brace Test - Print this to test distance and angle between seat post and rack.
Seat Post Brace - Print the test piece first and make any dimensional adjustments before printing this. Press 4 M4 inserts for connection to rack top and 1 M4 for optional attachment point.
Rear Axle Rack support - Print 2 and press 2 M3 inserts for grub screws and 1 M4 for optional attachment point.
Side Brace - Print 2 and press 2 M4 inserts in each for attachment points.
Non-printed Parts
Four 3/8" - 400mm aluminum rods.
1/2" material of your choice. 160x450 I used HPDE but could have used wood or any strong light material.
1 - M5 insert and bolt for seat post clamp.
8 - M4 inserts and bolts for attaching brace and top supports.
3 - M4 inserts and bolts for the axle and seat post brace are optional as attachment points.
8 - M3 inserts and grub screws to hold al rods (optional? with have tight fit)
Notes to self:
Add M4 inserts to Side Brace for attachment points? M3 for grub?
Possibly move top support inserts further apart?
Rear Axle Rack Support could angle holes. Currently 90 degrees to axle.