Overview Reviews Product Description XTR Headset Crown race Rare 27.0mm ! Shimano M900 1" Vintage Mountain Bike NOS Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × XTR Headset Crown race Rare 27.0mm ! Shimano M900 1" Vintage Mountain Bike NOS Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments