 Topic Name: Rack mount
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on: December 11, 2017, 10:26:31 PM
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Lindsay
Location: Australia
Posts: 10
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« on: December 11, 2017, 10:26:31 PM » |
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Hey guys I have a challenge for all you handy diyers. I am trying to figure out a good system for attaching a rear rack to my giant xtc+. It has no rackmounts, no mudguard mount, no seatclamp and a dropper post which has to be slammed to give me my correct seat height so no seat post to play with either. The rear axle is boost 148x12.. The seatstays are carbon so I am reluctant to use clamping force on this area. I have done heaps of research but it will require a custom job.
For the lower mounting points I have found the yoke mount thru axle by Robert axle project that has an m10 threaded part on each side. This is larger than the default hole on most racks that are designed to take an m5 bolt, so I will probably have to modify the bottom mounting point on the rack. I will also require a rack that is wide enough to clear the axle and frame(172mm according to the Robert axle website). Thankfully the disc brake sits inside the frame.
I also need to make sure the upper section will clear a 27.5 x 2.8 tire.
As for the upper mounting point I'm extremely limited in options and will probably have to custom Mount it to the seattube. I feel the strongest point is above the seat stays and below the top tube as it has the seat post reinforcing this area( see picture) however this area is an interesting shape and will need something that will be able to match the contours. I'm thinking of using something similar to the revelate handlebar harness mount but using a more sturdy strap attachment with rubber frame protection.
As for the rack I am looking to mount a 10 litre drybag on either side as it will be lighter and more aerodynamic than a traditional pannier setup, as well as providing heel Clarence( xtc chain stay is short and I have big feet). I have included a sketch to give a better idea of my drybag idea.
Just wondering if anyone else has had these issues and has any advice/ things they would do differently.
Also need suggestions for rack selection, preferably lightweight and wide enough to clear axle and tire.
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Topic Name: Rack mount
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Reply #1 on: December 11, 2017, 10:27:34 PM
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Lindsay
Location: Australia
Posts: 10
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« Reply #1 on: December 11, 2017, 10:27:34 PM » |
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Robert axle project axle with m10 studs
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Topic Name: Rack mount
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Reply #2 on: December 11, 2017, 10:33:34 PM
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Lindsay
Location: Australia
Posts: 10
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« Reply #2 on: December 11, 2017, 10:33:34 PM » |
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Possible mounting point ( marked with yellow strap)
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Topic Name: Rack mount
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Reply #3 on: December 11, 2017, 10:40:41 PM
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Lindsay
Location: Australia
Posts: 10
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« Reply #3 on: December 11, 2017, 10:40:41 PM » |
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Idea for mounting drysacks. The idea being I will have clearance for my heels as well as being able to shift my weight over the rear wheel when the post gets dropped on more difficult sections.
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Topic Name: Rack mount
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Reply #4 on: December 12, 2017, 05:55:32 AM
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werkinit
Posts: 51
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« Reply #4 on: December 12, 2017, 05:55:32 AM » |
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You can have threaded inserts riveted into your frame.
You may be able to find or make small bolt up U clamps that will wrap around your seat stays which you can attach the rack to.
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Topic Name: Rack mount
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Reply #5 on: December 12, 2017, 06:08:53 AM
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Lindsay
Location: Australia
Posts: 10
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« Reply #5 on: December 12, 2017, 06:08:53 AM » |
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Might consider attaching to seat stays, not willing to drill the frame for structural and warranty reasons.
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Topic Name: Rack mount
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Reply #6 on: December 12, 2017, 06:18:17 AM
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Iowagriz
Posts: 251
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« Reply #6 on: December 12, 2017, 06:18:17 AM » |
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If you could sacrifice 3/8" of dropper, then you could use one of the seatpost clamps that also incorporate a rack mount. https://problemsolversbike.com/files/product_images/ST06086.jpgIt appears that your frame doesn't use a seatpost clamp, but placing this at the normal seatpost clamp spot with enough force to not hinder the dropper should work. |
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Topic Name: Rack mount
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Reply #7 on: December 12, 2017, 11:30:30 PM
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Lindsay
Location: Australia
Posts: 10
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« Reply #7 on: December 12, 2017, 11:30:30 PM » |
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I'm currently running flat pedals, got some SPD pedals and shoes coming in about a week so that might give me some seat post room as I will be further back on the pedals, hoping I will have clearance for on of those clamps. Going to have to file the lip off the inside of the clamp to make it flush for the post. Still wondering about the rack, might have to look for something designed for a fatbike, unfortunately rack brands don't specify the width between the legs.
Also looking at dry bags i didn't realise 10L was so large, might just go with one mounted on top.
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Topic Name: Rack mount
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Reply #8 on: December 13, 2017, 12:31:14 PM
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werkinit
Posts: 51
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« Reply #8 on: December 13, 2017, 12:31:14 PM » |
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Topic Name: Rack mount
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Reply #9 on: December 14, 2017, 02:41:14 PM
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bikeny
Posts: 140
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« Reply #9 on: December 14, 2017, 02:41:14 PM » |
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If you can give up some of the seatpost, Salsa makes 2 versions of their clamp with rack mounts. One is uses as the seatclamp and has the lip, the other is mounted to the seatpost itself and has no lip. I think that would be the best solution for the upper mounts. http://salsacycles.com/components/category/racks/post-lock |
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Topic Name: Rack mount
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Reply #10 on: December 28, 2017, 06:40:40 AM
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werkinit
Posts: 51
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« Reply #10 on: December 28, 2017, 06:40:40 AM » |
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