AR7E - Alcester Racing 7's Equipe
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Step two of the Sigma bike computer installation is another two-parter, but as you will be mixing up some 5-minute epoxy resin, you'll need to be ready for both parts: Step 2a - Glue Magnet to WheelRemember, we are going to tie-wrap the sensor to the cycle-wing stay so that it just clears the inner edge of the wheel rim:
<Click Image for Full Size> The magnet needs to be mounted just in the inner lip of the rim - approximately where the 'A' in Sigma is in the image above. The clearance between the magnet and the sensor needs to be less than 5mm, but this can be fine-tuned somewhat by tweaking the final position of the sensor. Clean a patch on the inner face of the rim using either alloy wheel cleaner or 'tar, bug and grime remover'. To make life easy during the gluing, we'd recommend cleaning the part of the rim at the bottom of the wheel - this makes it less likely that the magnet will fall off before the glue has set... Offer up the magnet in a dry-run and make sure you are confident that the magnet will be close-enough to the sensor, but not protruding so much that it fouls on anything. When you are happy, set the materials and parts aside and move onto Step 2b: Step 2b - Head Unit MountRemember what we are trying to achieve here: We want to attach the head-unit mount to the plastic angled block so that it will fit onto the windscreen at a useable angle as in the following picture:
<Click Image for Full Size> First of all, we need to remove the bike handlebar adapter plate from the back of the head-unit mount. This plate has a contoured face that fits snugly against a tube (the handlebars) - but we want a flat plane on the back of the mount to match that of the plastic wedge. The adapter plate on the BC1200 mount is held on by four tiny screws - simply remove these and throw away the plate (in an environmentally friendly way, natch). We'll be gluing two pieces of hard plastic together - if this is going to work at all, we'll need to create a nice, rough surface for the glue to grab hold of. We found that scoring the two gluing surfaces with a sharp knife was sufficient. Watch your fingers now though... Now, look again at the picture above. Looking at the triangular profile of the plastic block, you'll see that one short face will attach to the screen, and the long face will be glued to the head-unit mount. You will also notice that the top of the head-unit mount and the top of the long face are aligned. If the head unit was mounted any higher, you'd not be able to get to the top computer button properly (and you need this for operating the stopwatch and resetting various measurements on the move...) Step 2c - Glue!OK, steps 2a and 2b were just preparation - now that you are happy (measure twice etc...) mix the epoxy and glue the magnet to the wheel and the head mount to the block. You might find it easiest to use some tape to hold the magnet in place and/or the head-unit/block together until the glue has properly set. Success? Good, now let's get on with Step Three: |
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