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01-02-2019, 09:31 AM
| #1 |
| Newbie Join Date: May 2018 Location: US
Posts: 20
|  HH 21t sport
Anyone running a HH 21t sport 550 motor in the TRX4? I just got one today and was wondering what pinion you guys are running with it. I really like the wheel speed of the Titan 21t in 2nd gear but was looking for a bit more torque in low gear.
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01-02-2019, 09:35 AM
| #2 |
| Quarry Creeper Join Date: Apr 2018 Location: US
Posts: 364
| Re: HH 21t sport
I'd say you could drop 2 teeth and still keep good speed. The HH motor will certainly have more torque to begin with, but dropping teeth will add to it nicely. Sent from my Pixel 2 using Tapatalk |
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01-02-2019, 09:41 AM
| #3 | |
| Rock Crawler Join Date: Jun 2018 Location: Orange County, CA
Posts: 711
| Re: HH 21t sport Quote:
I have it. Just not installed yet. With 3S power I’ll probably drop down a couple. Sent from my iPhone using Tapatalk | |
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01-02-2019, 02:07 PM
| #4 |
| RCC Addict Join Date: Feb 2012 Location: UK
Posts: 1,015
| Re: HH 21t sport
Or for other prospective buyers r just get the 27t with stock gearing. Works a treat.
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01-04-2019, 05:37 AM
| #5 |
| RCC Addict Join Date: Mar 2018 Location: Ocala, Florida, USA
Posts: 1,213
| Re: HH 21t sport
I switched to the 9t pinion when I had the stock motor in mine. It drops the top speed a couple miles an hour not to much tho. I went with the trail master 27t with 9t pinion. torque for days now but top speed isn't all that fast. Think John Holmes said i with stock motor going from stock 11t pinion to the 9t you lose about 20% of top speed. He also said going from the 21t to the 27t would drop your top speed about 20%. So if mine was 13mph stock. Then now with 27t motor and 9t pinion I'm only getting about 7 or 8 mph top speed. It's a crawler so I'm not worried about top speed. I Love how this set-up is doing in my rig. Hope this helps.
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01-04-2019, 07:06 PM
| #6 |
| Quarry Creeper Join Date: Dec 2009 Location: Cape Cod
Posts: 243
| Re: HH 21t sport
My RPP order just arrived (fast as always) and I realized I ordered the wrong HH motor. I intended to order the 21T but I ordered the 27T by mistake  By the time I pay shipping both ways is isn’t worth sending back. From what I’m reading here it doesn’t seem like that big a deal to run the 27T anyway. I can always go up in pinion to compensate for lost speed, but I run everything on 3s anyway.
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