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Going there tomorrow, not sure if there's any on site?
Escape Route in Pitlochry
Bothy or mikes bikes in Aviemore
There may be other options.
Would cycle shop at Fort William Dh/Red route car park not hire that's close by?
Depends entirely on which direction you are coming from.
Escape Route (Pitlochry) and Bothy Bikes (Aviemore - well Dalfaber actually) should probably be able to sort you out with a full sus.
If you are travelling up the A9, another option could be Alpine Bikes (Tiso) at the Inveralmond Roundabout (Perth) - not sure what their hire fleet comprises though.
FWIW, Nevis Cycles are taking over the bike shop/hire facility at Nevis Range soon.