SBA gearing from 1.6" Cobra to 2" Challenger/Series 4 - HCS Snowmobile Forums

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Old 08-12-2019, 10:41 AM   #1 (permalink)
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Default SBA gearing from 1.6" Cobra to 2" Challenger/Series 4

Hey all. I can't seem to find a definitive answer to this as well as guys asking about older sleds and not the SBA specifically.

The gearing that comes with the 1.6 Cobra is different from the 2". Should I purchase a 19/40 and chain set when buying the 2" track or am I okay to run the 22/41 it came with on a taller track? 2.10 vs 1.86 ratios, respectively. Also, what kind of spring/weights should I switch to? Probably just call NSP?

Still going to be a trail sled when needed (we live in the midwest, trails are required for everything) but top end is no longer a concern. My buddies and I are hooked on the offtrail riding and they all went and bought 154 BCXs and Summits. A new sled is not in the cards any time soon for me and I'm super comfortable on this sled on the trail and in the powder.
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Old 08-12-2019, 05:19 PM   #2 (permalink)
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If top speed isnít a concern, you have nothing to lose by gearing down
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Old 08-12-2019, 07:50 PM   #3 (permalink)
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Definitely gear it down.
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Old 08-14-2019, 01:32 PM   #4 (permalink)
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I just did the same thing I had 23-40 or 1.74 I didn’t go with 2.10 or 20-42 (to low)
I installed 23-44 and used 72 link chain
I’m around 1.91
If you look up the gearing chart you’ll see your options.
I haven’t tried it out yet but I here 2.10 is too much.
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Old 08-14-2019, 01:35 PM   #5 (permalink)
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Oh yeah I installed adjustable weights and springs. Use the search tool. There’s some good info from other members
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Old 08-14-2019, 06:52 PM   #6 (permalink)
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I have the chain and both gears from my 2018 when I swapped to the 1.6 from the 2.0 on my sba last year. About 1k miles on them if you're interested.
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Old 08-15-2019, 06:30 AM   #7 (permalink)
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if running a 2" track you need the 2.10 ratio if ever going off trail. you will over heat your clutches with anything less. a higher ratio would be o.k. if just mostly on trail. we test this stuff all the time with a heat gun etc. to see what ever change does. clutch/belt heat is not a good thing.

the biggest change clutch wise is going to be a helix/ spring change if running a 2" or greater track lug height. and run SLP magnum force weights. after testing ever weight there is these perform the best. have incredible belt grip down low that no other weight has. proven time again on a porta tree timing system and side by side drag racing in real world conditions. lake racing etc. in snow not on shaved ice etc. we try to make a difference in the snow that trail riders ride in. while we also do ice race set-up's we know the difference in what most guys want. corner to corner pull.

we have worked real hard on deep snow RMK,SKS, and ASSAULT clutching as of late. so a lot of gear and clutch testing has been done. in a deep snow on a lake race 2-3' of untouched snow. our BMP piped NSP clutched RMK showed it's tail light to 850 polaris, 850 doo, mod. 800 cat's and one alpha one. by a lot.
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