The Shimano Altus FC-M371 is a great choice for large wheel diameter mountain bikes. With its 44/32/22T gearing, it offers a wide range of gears and lower ratios, making it perfect for entry - level riders or those tackling steep climbs. It features a 3x9 speed setup, 175mm crank arm length, and a 50mm chain line. Compatible with HG 9 - speed chains, it comes with a crank fixing bolt. The recommended bottom bracket is the BB - UN300 (threaded), and it has a Q - factor of 180.5mm.

Using your Shimano Altus FC - M371 front crankset is straightforward. Just make sure it's properly installed on your bike with the recommended BB - UN300 (threaded) bottom bracket. When riding, shift gears smoothly to make the most of the 44/32/22T gearing. For entry - level riders, start with the larger chainrings on flat terrain and switch to the smaller ones for steep climbs. As for maintenance, regularly clean the chainrings and the crank arms to keep them in good condition. Check the crank fixing bolt periodically to ensure it's tight. If you notice any unusual noises or difficulty in shifting, it might be time to take your bike to a professional for a check - up.