Thekey difference between 27.5″ (also known as 650b) and 29″ mountain bikes lies in the wheel size. A 29″ bike has larger wheels compared to the 27.5″ bike.

Asa general rule, the usage cases are: 26-inch – Pump track, dirt jump riding, kids’ MTBs 27.5-inch – Experienced downhill riders and smaller riders (under 5’9″) 29-inch – Enduro, cross-country, trail

Isa mullet bike with a 29in front wheel and 27.5in rear wheel faster than a 29er? We put both to the test to find out.

WhyGo 26 Inch? – The tyres and tubes are easier to find in developing parts of the world. – 26inch wheels use shorter spokes than 700c to build a stronger wheel. – 26inch touring frames generally have greater tyre clearance for fatter tyres. – There are more 2+ inch touring tyres available in 26inch. TrekFarley Carbon. 27.5 Fat. 2554 grams. Trek Farley Alloy. 27.5 Fat. 3310 grams. As you can see, the Specialized Fatboy carbon, which is a 26″ Fat model, has a significantly lower weight than other carbon models and the Specialized Fatboy M5 Alloy is lighter or very comparable to even some carbon offerings.
Sotry both and see if there's a significant difference in comfort. Even just inside the shop or its car park can be instructive. At 155cm you’ll probably need the smallest frame size for a bike with 622mm (28"/29") wheels. The smallest frame size often has to make some compromises to allow 622mm wheels to fit.
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26 vs 27.5 vs 29 inch wheels