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-5C at the Linn of Dee, cycled on frozen track to Derry Lodge as the sun rose lighting hills rose. We continued over the boggy ground towards Glen Luibeg and dumped the bikes. Climbed over Carn a Mhaim then dropped down to Lairig Ghru and to Corrour Bothy. Ascended Coire Odhar via steep headwall with crampons on hard neve. Back to Corrour in 2hrs. Then out to bikes and freewheeled back to Linn of Dee in the dark. A cracking day out and the zero wind had made such a difference.