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I just got a rack to mount on the rear of my bike frame, but I'm puzzled at which mounting holes to use. On the right side of the bike there's an obvious screw hole for mounting, but the corresponding spot on the left side has something in the screw hole so I can't use it. Hopefully you can see the silver obstruction in this picture -- mounting hole would be just above and to the right of the axle.

enter image description here

The other screws are holding on the disc brake, so I don't think I want to mess with them.

The bike is a Trek 3500, the rack is a Blackburn Local Spring Clip.

Looking for advice on how to proceed with mounting this.

bstpierre
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  • Is the obstruction a sheared-off rack bolt? – Swifty Jul 28 '18 at 16:03
  • Did you verify the rack is disc compatible? many of them are not. – mikes Jul 28 '18 at 17:52
  • Yes this rack was specifically purchased for compatibility with discs. – bstpierre Jul 28 '18 at 19:39
  • I doubt the obstruction is a sheared-off bolt -- I haven't had any rough rides that would have broken it, and it appears to have a Z on the end of the bolt so I wonder if it is something intentionally installed as part of the ZOOM brake system? – bstpierre Jul 28 '18 at 19:40
  • It is difficult to see in the photo but to me it appears the large hole is for the QR (quick release) to pass thru. – mikes Jul 28 '18 at 20:07
  • What’s on the other side of the z stamped obstruction? Did the brakes come fitted when new? – Swifty Jul 28 '18 at 20:32
  • @Swifty - that's a fairly standard way to mount racks when you have disc brakes. Indeed for this rack, you can mount it with an extra long QR skewer through that hole: https://www.blackburndesign.com/media/blfa_files/Blackburn-Local-Racks-Manual_1.pdf – Batman Jul 28 '18 at 22:45
  • @Swifty the mounting plate/bracket are on the backside of the obstruction. – bstpierre Jul 29 '18 at 01:35
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    @Batman so is the answer just "use the long skewer" ? I guess that's just option 2 if I had RTFMd properly. Thanks. (And you should leave that as an answer so I can accept it.) – bstpierre Jul 29 '18 at 01:35
  • @mikes should really write/get the answer accepted – Batman Jul 31 '18 at 04:22

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The quick release skewer is the lower mounting point, remove the skewer pass it through the rack and reinstall. After the lever is tightened, verify that the threaded rod end comes to the edge of the acorn nut. If the threaded rod is not visible you will need to source a longer skewer.

mikes
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