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Author [ES] [CA] [PL] [PT] [IT] [DE] [FR] [NL] [DK] [NO] [GR] [TR] Topic: Gearing  (Read 81973 times)

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Offline WaffleHouse

  • Inazuma Member
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Re: Gearing
« Reply #224 on: May 23, 2019, 07:54:26 AM »
*Originally Posted by Robell [+]
The standard Inazuma is under geared, so I doubt you'll improve acceleration much.
There'll always be  a limit to the pulling power of 24 bhp  :001:

I answered your post earlier today, but I do not see it.  Odd.
What I basically said was that acceleration does suffer, but I'm okay with it.

Offline enzo

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Re: Gearing
« Reply #225 on: May 23, 2019, 03:33:02 PM »
ok well then the original gearing does ok for me because all i need is acceleration as i ride in bad roads and heavy traffic

Offline Alianto

  • Inazuma Junior
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Re: Gearing
« Reply #226 on: July 26, 2019, 04:38:10 PM »
Hello, I just bought my inazuma :305:, and I don't like stock gearing, so I ordered 15T sprocket from aliexpress. I am thinking to replace rear sprocket to 41T or 45T as well. Just a question if I can keep existing chain in terms of chain length? or do I need longer/shorter chain when changing from 14/46 to 15/41 or 15/45 ?

Offline WaffleHouse

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Re: Gearing
« Reply #227 on: July 27, 2019, 02:43:25 AM »
Stock chain length is 116.
I have 15/39 gearing and 114.
I'm sure someone who has exactly what you want will be along shortly, but
I would guess you will not need a longer chain, even if you choose 15/46.
I'm not sure about finding a master link. I tried years ago to get one and the dealer told me sizes of  links/plates vary according to chain model. Rather than screw with it, I simply bought a new chain, DID 520 VX2. It has a removable clip.

I hope this is of some help.

Offline Kantara

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Re: Gearing
« Reply #228 on: July 28, 2019, 04:30:29 PM »

Had my dealer change my rear gearing with a stock one, plus new stock chain and a 15T front gear.  Only reason I chained my chain was the links were beginning to weld together.

The reason I changed to a 15T front  was I didn't need to rev so much taking away.
Kantara

Offline xris_xcess

  • Inazuma Pro
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Re: Gearing
« Reply #229 on: August 14, 2019, 03:49:16 PM »
*Originally Posted by WaffleHouse [+]
Stock chain length is 116.
I have 15/39 gearing and 114.
I'm sure someone who has exactly what you want will be along shortly, but
I would guess you will not need a longer chain, even if you choose 15/46.
I'm not sure about finding a master link. I tried years ago to get one and the dealer told me sizes of  links/plates vary according to chain model. Rather than screw with it, I simply bought a new chain, DID 520 VX2. It has a removable clip.

I hope this is of some help.

Hi

How does that gearing behave on the highway? rpm at 100km/h? 120km/h? Top speed? How about pulling away in 1st? and finally, do you find yourself dropping more often into 5th or 4th?

I would also like to try that gearing, but dont really want to get a whole new chain just for that... I guess I could buy a cheap roller chain and if I like it, cut the main one (new master link of course) :084:

Sorry for all the questions!
Candy Red 2015

Offline Innerzoomer

  • Inazuma Junior
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  • Posts: 5
  • Country: England
Re: Gearing
« Reply #230 on: June 05, 2021, 04:24:21 PM »

I've read through various threads on this topic. Due to the speedometer being driven from the gearbox output shaft, any increase in the mph/000 rpm will not affect the speedometer readings. The ratio of the speedo reading to the tachometer reading will be unaltered. It is understood that the speedometer overreads with the 14/46 final gearing and that changing the gearing to 15/46 will increase the road speed for a given rpm figure, and that the true road speed will be closer to the indicated road speed. I have done some calculations intended to show the true effects of fitting a 15T front sprocket with regard to the accuracy of the speedometer readings and the reduction in engine RPM at cruising speeds. I observed that my bike showed 58mph@7000rpm in 6th and 62mph @7500rpm. I do not know, of course, how accurate the tachometer actually is, but I calculated what the true road speed should be at 7000rpm in 6th. I measured the circumference of the new Pirelli 14/70-17 rear tyre, which was 77.25" (not 77.65" as suggested online for a tyre of this size). The number of rotations of the rear wheel in one minute is 7000 X 0.3088235 (primary reduction) X 1.2376237 (overdriven 6th) X 0.3043478 (final drive 14/46). Multiplied by 77.25 that gives the distance in inches travelled in one minute at 7000rpm. Multiply that by 60 to get the distance travelled in one hour and then divide by 36 and 1760 to convert to miles per hour (36" to the yard and 1760 yards to the mile). At 7000rpm the actual calculated road speed is 54.976032mph on my Pirelli. So, assuming the tachometer is accurate, the speedo is 3mph fast at 55mph true, showing 58mph. Changing to a 15T sprocket would result in a calculated true road speed of 58.6mph @7000rpm, so that the speedo would underread slightly, again assuming that the tachometer on my bike is accurate. At an indicated 60mph, true speed would be 60.61. At indic. 70mph, 70.72. At indic. 80mph, 80.82. The reduction in engine speed resulting from the 15T sprocket is from 7678rpm to 7167rpm at 60mph, 8958 to 8361 at 70mph, and 10237 to 9555 at 80mph. It is worth noting engine speed reduces by 899rpm when changing up from 4th to 5th at 7000rpm, by 778rpm when changing up from 5th to 6th at 7000rpm, and by 467rpm by changing from 14T to 15T at 7000rpm, so it is almost equivalent to what a 7th gear would give with the 14/46 final drive, as the higher the gear, the smaller the ratio gap from the previous gear. These calculations regarding engine speed reductions due to the 15T sprocket do not depend on the accuracy of my tachometer. In conclusion, the replacement of the 14T with the 15T does give a worthwhile reduction in engine speed when cruising and, assuming the accuracy of my tachometer, results in the speedometer underreading fractionally. The mileage recorder will presumably underread to the order 6.7%, if it was previously accurate. I understand that GPS observations suggest that the speedometer may, in practice, still overread fractionally. I have yet to put that to the test on my bike. I have yet to receive my 15T sprocket, for that matter!


 


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