I have a disc wheel and my bike moves around if it's windy when it's racked, so I use this to secure it.
https://www.northerntool.com/products/gear-tie-reusable-rubber-twist-ties-2-pk-18in-model-gt18-01-2r3-23480?cm_mmc=Google-LIA&utm_source=Google_LIA&utm_medium=Storage%20%2B%20Organizers%20%3E%20Storage%20Straps&utm_campaign=Nite%20Ize,%20Inc.&utm_content=23480&ogmap=SHP%7CLIA%7CGOOG%7CSTND%7Cc%7CSITEWIDE%7C%7C%7C%7C%7C856744519%7C42214683343&gad_source=1&gclid=EAIaIQobChMI3rrwluybgwMVmKNmAh2cxQSTEAQYAiABEgKsIfD_BwE&gclsrc=aw.ds
I saw a tall dude using this to secure his bike as well. It's easy to remove and you will lose maybe like 10 sec during transition. Not recommended for Sprint though.
https://www.northerntool.com/products/gear-tie-reusable-rubber-twist-ties-2-pk-18in-model-gt18-01-2r3-23480?cm_mmc=Google-LIA&utm_source=Google_LIA&utm_medium=Storage%20%2B%20Organizers%20%3E%20Storage%20Straps&utm_campaign=Nite%20Ize,%20Inc.&utm_content=23480&ogmap=SHP%7CLIA%7CGOOG%7CSTND%7Cc%7CSITEWIDE%7C%7C%7C%7C%7C856744519%7C42214683343&gad_source=1&gclid=EAIaIQobChMI3rrwluybgwMVmKNmAh2cxQSTEAQYAiABEgKsIfD_BwE&gclsrc=aw.ds
I saw a tall dude using this to secure his bike as well. It's easy to remove and you will lose maybe like 10 sec during transition. Not recommended for Sprint though.