GREAT UPGRADE Purchasers of a Mongoose M-3.5, M-3.5a, and M-3.5b may upgrade to the full functionality of the new M-3.6 with this option. We will re-machine your Mongoose frame to accept the new "deadbolt lock" of the m-3.6 and replace both upper and lower hubs with new M-3.6 design hubs. You will gain a bubble level in the base if you do not have one at present (M-3.5 and M-3.5a owners) and added load capability for M-3.5 owners. This is the best choice for M-3.5 owners and a good choice for M-3.5a owners who want to add the bubble level. There will be about a 5 to 10 day turnaround for this option.

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