T120 90 MPH....RPMs? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 32 (permalink) Old 08-20-2019, 04:06 PM Thread Starter
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T120 90 MPH....RPMs?

I take a certain trip a few times per year and i do 90 MPH most of the way to get there before my old man's body gives out on me. Plus i'm just an impatient sort. At 90 my Tbird is barely breathing, but i am contemplating a T120 and was wondering how fast the engine is spinning at 90 MPH should i decide to use that for my trips. Anyone know?
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post #2 of 32 (permalink) Old 08-20-2019, 04:23 PM
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you need to specify exactly what year and model machine you are riding in order to obtain the gear ratios.

i ride way-old T120s, and based on the gears and wheels in my machine, my 1965 T120 is doing 4850 at 90.3 mph in 4th.

i be kevin

Last edited by speedrattle; 08-20-2019 at 04:27 PM.
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post #3 of 32 (permalink) Old 08-20-2019, 04:53 PM
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Quote:
Originally Posted by TorqueBird View Post
I take a certain trip a few times per year and i do 90 MPH most of the way to get there before my old man's body gives out on me. Plus i'm just an impatient sort. At 90 my Tbird is barely breathing, but i am contemplating a T120 and was wondering how fast the engine is spinning at 90 MPH should i decide to use that for my trips. Anyone know?
I don't know the RPMs but 90mph on a new T120 is easy, as long as the wind doesn't tire you out or you have a windshield. One thing about the new bikes, is that 6 gear really keeps the RPM's in check

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post #4 of 32 (permalink) Old 08-20-2019, 04:54 PM Thread Starter
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This is the water cooled forum so i thought it should be obvious. The current T120.

Quote:
Originally Posted by speedrattle View Post
you need to specify exactly what year and model machine you are riding in order to obtain the gear ratios.

i ride way-old T120s, and based on the gears and wheels in my machine, my 1965 T120 is doing 4850 at 90.3 mph in 4th.
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post #5 of 32 (permalink) Old 08-20-2019, 04:57 PM
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An even 4,000 RPM on my T120 is 88 MPH indicated. Noticed this the day I took delivery of the bike. Triumph recommended that 4,000 RPM not be exceeded during initial break-in. This was really easy to stick to as I went sailing down the superslab on the way home.

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post #6 of 32 (permalink) Old 08-20-2019, 05:00 PM Thread Starter
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Quote:
Originally Posted by vistavette View Post
I don't know the RPMs but 90mph on a new T120 is easy, as long as the wind doesn't tire you out or you have a windshield. One thing about the new bikes, is that 6 gear really keeps the RPM's in check

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So 90 MPH for most of a 7 hour rides seems easy for it? If anyone knows the RPMs i'd still be interested. I found a video review and shots of the cluster as he was riding seemed to indicate 70 MPH and 4000 RPMs. Seems kinda high given i'm talking 90MPH. I had a 05' speedmaster that was at 4k at 70 MPH and at 90 i think it was at 5500 which is rather high given the redline. I would think the 120 would be geared higher then 4k RPMs at 70, tho maybe the guy was in 5th, i dunno. But i wouldn't think so, as i have a thunderbird that is at 3k at 80 and yet i typically don't cruise at 70 in any gear but 6th. Why would you? Twisteis, yeah, but highway cruising at 70 i would think anyone would use top gear unless passing.
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post #7 of 32 (permalink) Old 08-20-2019, 05:00 PM
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On a 2018 T120 less than 5000 rpm, I changed to a 42 tooth rear sprocket from the 37, so mine rev's higher but I was still below 6000 rpm.
Before the sprocket change the 4000 rpm limit of breakin, was about 80 mph

If your are under redline it should be fine. You will need a windscreen of some sort, 90 on a naked bike is hard work after 30 minutes.

It is what it is, until it isn't
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post #8 of 32 (permalink) Old 08-20-2019, 05:05 PM
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@vistavette would use his K1600GTL for that ride because the cruise will hold it north of 120 all day long and there's a nice fairing to hide behind
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It is what it is, until it isn't
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post #9 of 32 (permalink) Old 08-20-2019, 05:07 PM
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Originally Posted by aj7840 View Post
@vistavette would use his K1600GTL for that ride because the cruise will hold it north of 120 all day long and there's a nice fairing to hide behind
Ha! You read my mind. I was just going to post the same.

90 on my '16 T120 (I sold it recently) was no sweat for the bike, but 7 hrs at 90 on anything is hard on a machine.

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post #10 of 32 (permalink) Old 08-20-2019, 05:22 PM Thread Starter
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Well, i have no windshield on my Tbird and i'm 66 in a few days and just got back from that trip a couple weeks ago. Yeah, it beats ya up a bit, but i grew up riding w/o windshields and i can handle it. The bike can too, as at 90 MPH it's only about 1/2 way to redline. In fact 90 is the low end, i have it to 95-100 much of the time only dropping down to 80-85 thru major metro areas where the HP is watching. (and watching my rear-views like a hawk.

Anyways, i do want to be able to stay at 90 the majority of the7 hour ride w/o beating the engine up. If the T120 isn't up to that i'll have to rethink what i wanna do.
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