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Old 05-21-15, 11:23 AM
  #10  
Dave Mayer
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Here are some considerations for your task:
  • A 11-speed compatible wheel is substantially inferior for what you want to do relative to a 7-speed wheel. The 11-speed wheel, due to the width of the freehub body, has much more dish and spoke tension differential than a 7-speed wheel. The drive-side spoke tension is double that of the non-drive, which leads to an inherently weaker structure. To try and overcome this deficiency, manufacturers have to execute tricks such as 2 x 1 lacing patterns and extra heavy rims to provide support. For 7 speeds, you actually want a 7 speed rear wheel. It will be stronger, more stable and lighter.
  • You do not want 7 or 8-speed Dura-Ace anything. Maybe the front hub or the last generation brakes. But the shifters, derailleurs and freehubs are completely orphaned and incompatible with anything else that Shimano made before or since. There is a reason why this stuff clutters up Ebay.
  • A standard bike shop will provide no help. Their only motivation will be to sell you a new bike. You are on your own.
Recommendation:
Replace the rim on your existing wheel. Just the rim - keep all of the spokes except if they are broken or gouged for some reason. I have used the same spokes for 4 successive rim replacments on one wheel. Find a rim with the same ERD as what you have. Should cost around $50. Tape the two rims together with a few pieces of electrical tape. Transfer the spokes over one by one from the old rim to the new. This will take about an hour, during which you can listen to the Giro. Truing and final tensioning - you may want a pro for this.
Overhaul your old hub and apply fresh grease and oil for the freehub.
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