Tire sizes are different for both mountain band cruiser bikes, smaller 26-sized bikes are compatible with the cruiser frames and cruiser rims, and you can install 26-size bike tires on your cruiser bike, but it is not possible to install all sizes and widths of mountain bike tires on a cruiser bike. tires are different based on their widths, combo designing, and tread patterns, due to which these are different from the other categories of bike frames, you have to measure the tire width and rim bead for mounting MTB tires on a cruiser.
Cruiser bikes are not used for riding on hard and rough trails but these bikes are used for roads, street ridings, and for local use purposes, so it shows that you have to find thin and narrow mountain bike tires with less combo and without tread pattern, because MTB tires are thick and heavy and decrease the speed of a cruiser bike and also increases pedals striking and tire you as a result of fatigue, so mountain bikes also have slick tires which you can have to find on mechanics shops and from your friends because it would not be a better step to install thick combo MTB tires on a cruiser bike.
Cruiser bikes are single-speed bikes and are mostly used to ride on the beach, so if you want to insert mountain bike tires, these are heavier and fat tires, and also these tires would stick dirt and sand of the beach because MTB tires are different from the cruiser tires, so you have to clean and service your tires after riding with the MTB tires on a cruiser bike.
27.5 and 29-sized tires of mountain bikes are not installed on beach cruiser bikes but there are a lot of 27.5 MTB tires that have been installed on cruiser bikes and have been used for riding for a long time basically if we discuss the compatibility and recommendations then, you have a single option which is 26-sized wheels, although 26-sized mountain bike wheels are different in their widths, 1.95, 2.0, 2.3, 2.4, 2.5 diameter tires. all of these widths of MTB tires are easily installed and mounted on cruiser bikes without any issues or problems.
Bead Seat Diameter:
The edges of the tires are called tire beads and if the tire is compatible with the rim bead then MTB tires are compatible with the cruiser rim, you have to install 26-sized MTB tires on the cruiser frame and then check the bead if it is seated accurately without any popping of the tire from any place, both the tire and rim are compatible with each other, but if the tire is not seating accurately on the rim bead then MTB tire is non-compatible with the cruiser bike frame.
Internal Pressure Difference:
Mountain bike tires are inflated at lower 30 to 40 pressure but cruiser bikes are used for road and pavement purposes and are inflated at higher internal pressures, so if you install a thick tread MTB tire on a cruiser bike with higher internal pressure, the bike will not run smoothly, it is the reason slick mountain bike tires are recommended for cruiser bikes.
You can also run MTB tires with lower air pressure on a cruiser frame and rim, you will feel like you are riding on a mountain bike, another advantage of running with low pressure is that your cruiser bike would not dig within the water and sand when you want to ride a cruiser bike on beach sides.
Cruiser tires and MTB tires have their own recommended tire pressures based on the construction and type of rim, there are specific tires for hooked and hookless rims, and you have to inspect the model, brand, and category of your cruiser rim before installing MTB tire, and after mounting of tire inflate the tire with the air pressure, check and do an experiment on MTB tire with cruiser frame by inflating highest and lower air pressures, if the tire is bursting at higher air pressure then, never fill the tire with higher pressure, keep the tire pressure at a minimum level to avoid skipping and slipping of the tire from the rim.
Rain Water And Snow:
Fat mountain bike tires are used for snow trails, so you can easily ride with your cruiser bike in winter seasons when it snows all around, MTB tires are more durable, strong, and stiff as compared to cruiser tires, it is the reason mostly cruiser bike riders would install these tires for winter seasons, MTB tires have also a better response than cruiser tire above the water, cruiser tires will float above the tides of the water but MTB tires will give a good grip at their required pressure on wet trails.
Is It Possible To Ride A Cruiser Bike With MTB Tires For Offroading?
No, it is not possible to ride a cruiser bike with mountain bike tires on hard and aggressive terrains, the reason is that cruiser bikes do not support uphill, downhill, and cross country rides, these have weak frames as compared to MTB frames and also hub is not as much powerful as MTB hubs, so you can only ride cruiser bike with mountain bike tires just for fun and for street riding purposes, another difference is that cruiser bike is single speed bikes and mountain bikes have 7 speed and 10-speed gears for riding and uphills and cross country trails.