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No, 26-inch mountain bikes aren’t obsolete; they fill a nimble, budget-friendly niche for riders and rebuilds.

No, a 250cc dirt bike isn’t street legal out of the box; with the right equipment, emissions label, and registration, some states will plate it.

Yes, 250cc motorcycles can handle highway travel, but comfort and passing power depend on gearing, wind, load, and the posted speed.

Yes, 250cc bikes reach 75–95 mph, and sporty 250s can near 100 mph; gearing, wind, and rider weight shape how fast the bike feels.

Yes, 24-inch bikes for adults work for shorter riders or BMX cruisers; most grown riders fit 26–29-inch wheels better.

Yes, 21-speed bikes are good for budget riders who want a wide gear range for hills, though they add overlap and a bit more maintenance.

Yes, adults can ride 20-inch bikes, mainly BMX and folding models, but comfort depends on frame fit, bar height, and your intended use.

Yes, two-stroke dirt bikes are still being made by KTM, Husqvarna, GasGas, Yamaha, Beta, Sherco, TM, and Rieju.

Yes, two-stroke dirt bikes are reliable when maintained on schedule and ridden within their limits.

No, two-stroke dirt bikes aren’t universally better than four-stroke; each excels for certain riders, tracks, and budgets.