Originally Posted by
HillRider
OK, 6500 hubs and their contemporary Dura Ace 77000-series hubs did indeed require two cone wrenches as the locknuts had thin flats like the cones. The front hub required a 13 mm cone wrench on the cone and a 14 mm cone wrench for the locknuts while the rear hub required 14 mm cone wrenches for both. I've used Park cone wrenches on my 7700 hubs with no problems. I'm still not sure you don't have an opening width mismatch rather than a thickness issue.
Thanks! I was assuming both were 13mm. Because the 13 would slide over the cone flat. I wasn't paying attention to whether the locknut was a different size. An oversight on my part. Thank you!