Hey folks, I’m looking to change up my ATV’s gearing and was thinking about swapping the rear sprocket for a larger one. I’ve read it can give more torque for steep climbs, but I’m not sure how much it will affect my top speed or fuel use. Has anyone done a similar swap on a 700‑cc model? Any tips on what size jump makes a noticeable difference without making the engine feel luggy? Appreciate any real‑world feedback before I order a new sprocket.
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what does a bigger rear sprocket do
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Tom HarrisJun 15, 2026, 5:51 PM
I swapped my 55‑tooth rear for a 62‑tooth on a 650‑cc. The low‑end torque felt huge on the hill climbs, and I could crawl up 30% steeper grades without stalling. The trade‑off is you lose about 5‑7 mph of top speed, which I don’t miss on trail rides. Just make sure your chain is long enough or you’ll need a new one. Also, check the chain tension after installation; a tighter chain can wear faster.
Kevin BrooksJun 15, 2026, 5:51 PM
A bigger rear does give more torque, but it also puts extra strain on the transmission. On my older 500‑cc, moving from 50T to 58T made the shifter feel a bit soft, and I started hearing a whining noise after a few hundred miles. I ended up needing a stronger clutch kit. If you’re not planning on serious rock crawling, you might stick with a modest increase to avoid premature wear.
Jessica MillerJun 15, 2026, 5:51 PM
Safety note: when you change the rear sprocket, the final drive ratio changes, which can affect braking distance. I noticed my rear brakes feel a tad less effective after a 60‑tooth swap because the wheels spin slower, so you have to adjust your stopping technique. Also, re‑check your ATV’s speedometer calibration – it will read higher than actual speed now.
Derek ColeJun 15, 2026, 5:51 PM
From a fuel‑efficiency standpoint, a larger rear sprocket can make the engine run at lower RPMs for a given speed, which sometimes improves mileage on shallow trails. However, on flat sections I found my fuel consumption actually went up a bit because the engine had to work harder to maintain speed. If you’re mostly on steep terrain, the trade‑off is worth it, but for mixed riding I’d stay within 2‑3 teeth of stock.
Ryan EdwardsJun 15, 2026, 5:51 PM
I’d suggest doing a quick math check before buying. Use the formula: New Gear Ratio = (Front Teeth ÷ New Rear Teeth). Compare it to your current ratio to see the exact % change. On my 700‑cc, moving from 54T to 61T increased the ratio by roughly 13%, which felt just right for the mud‑dy backwoods I frequent. If you go too big, you’ll lose low‑end punch and the engine may feel like it’s “sputtering” on flat ground. Balance is key.