CycleChat Inaugaral Cryptic Puzzle

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Across
  1. 3. The exotic tree's inside (6)
  2. 8. Gold medallist found corruption in race meeting. (5)
  3. 10. Must dash, off to see Norman Tebbit. ( 2, 4, 4 )
  4. 11. Can titanium have fun around stoppers? (10)
  5. 12. Generator of confusion early in the week. (6)
  6. 16. Buttock support? No, lower than that! (6,7)
  7. 17. Street party, drug free, ends with a recording deal (6)
  8. 19. It started with strange brew. PM mistaken for bike part. (8,5)
  9. 21. It communicated with the hub? (5)
  10. 22. What, you want me to ride it without steering?
  11. 24. "Oh s...!" cry Irish, thrown by track cylist. (3,5,3)
  12. 26. Trodden underfoot, pleads madness. (6)
  13. 27. We hear Gangnam Style has a steady beat? (7)
  14. 28. Angry local is in the frame (8)
Down
  1. 1. Cherished French bike recycled in bed. (7)
  2. 2. Gangster with weapon out to bat for navigator (6)
  3. 4. Sprinter upgrades metallic Trek (6,6)
  4. 5. Accommodation in college for cyclist (6)
  5. 6. Fish falling from the clouds? I'll be exercising indoors then. (5,8)
  6. 7. French leader's a spineless cow! (6,6)
  7. 8. This one doesn't just come up for air. (5,4)
  8. 9. Very timid roller is held back (4)
  9. 12. Bikes sawed into shape? (5)
  10. 13. Ham snack diver about, a Manxman. (4, 9)
  11. 14. Golden Boyo turns against mother (7,6)
  12. 15. Rider who lasts. (8,5)
  13. 18. They left university early, but still have a supporting role. (4-4)
  14. 20. Accommodation causes cyclist a delay. (4)
  15. 23. Anger after destructive wind leaves NE without fast, fun bike race. (10)
  16. 25. Managed poet? You are, we hear, a tourist. (10)