http://mashable.com/2012/08/27/iphone-bike-mounts/
Check out the Quad Lock mounting system. Its by far the best iphone bike mount I have seen - Available from www.quadlockcase.com
http://www.rei.com/product/842939/lifeproof-bike-bar-mount-iphone-4/4s-case,-black?preferredSku=8429390001&cm_mmc=cse_PLA-_-pla-_-product-_-8429390001&mr:referralID=8b3eaf6d-f610-11e2-9389-001b2166c62d
Satechi CR-3800 Universal Bicycle Holder Wrench Mount http://www.satechi.net/index.php/satechi-cr-3800 [TOO BIG]
Scosche HandleIT http://www.scosche.com/handleit-bike-mount-for-mobile-devices $19 [BAD REVIEWS
BioLogic Bike Mount for iPhone 4 [WONT FIT]
iOttie 1-Touch Bike Mount
http://www.iottie.com/product/ProductDetail.aspx?ProductID=948&ProductType=340 $25 [APPEARS TO BE THE BEST]
http://www.rei.com/product/829993/timbuk2-goody-box-top-tube-pack {NEED TO TRY IT]