can the mirrors be tightened in place? wind blows them sideways

The band can be tightened around your handlebar to keep the mirrors from moving forward and backward...but the little mirrors themselves are on a swivel. They can be moved around pretty easily by your thumb to see to your side but if you are going fast on your bike then, unfortunatley, they could be blown sideways. In my opinion, they are almost too small for any kind of bike. I bought these but soon replaced them with larger ones because these were just too small for mine or my husbands bikes.

does the handle bars have to round

The location where I have mine are round, but I think the fibber straps would conform to other shapes as long as the other shape perimeter is shorter than the strap

Manufacturer	Hestya
Brand	Hestya
Product Dimensions	15.01 x 10.01 x 3 cm; 86.18 g
Manufacturer reference	Hestya-huf371
Position	Rear
Mirror Lens Type	凸面
Special Features	調整可能
Lift Type	手動
Item Dimensions L x W x H	15 x 10 x 3 cm
Item Weight	86.2 g

自転車ミラー 360度調節可能 回転可能なハンドルバーミラー 広角 自転車ミラー サイクリング リアビューミラー 耐衝撃 アクリル 凸面ミラー 安全 バックミラー マウンテンロードバイク用 2個セット

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自転車ミラー 360度調節可能回転可能なハンドルバーミラー広角自転車ミラーサイクリングリアビューミラー耐衝撃アクリル凸面ミラー安全バックミラーマウンテンロードバイク用 2個セット