[55x]

You should be OK. I have a '16 w/ about 3,000 and just switched to 15-42 w/ the OEM chain. I've heard some have had to flip their adjustment blocks around to make it work but mine were ok in the normal direction.

 

[X3M]

Everybody knows you never go "full Boldor"...

 

[off-road-biker]

We changed 16/40 to 15/42 at my girlfriends Duke 5R – works with same chain!
BUT we changed 2 weeks ago to 15/40 – 15/42 is to massive in town and hairpin curves

 

[gokes]

Put the 42 on today, went on fine after flipping the blocks. First ride tomorrow with the new gearing.

 

[cors187]

Going full boldor
The real spec about it, is 10% torque.
It could be the best mod for the 690 power/weight

Front Rear Ratio Torque Speed
15T 38T 2.53 +1.3% -1.3%
15T 39T 2.60 +3.8% -3.8%
15T 40T 2.67 +6.3% -6.3%
15T 41T 2.73 +8.5% -8.5%
15T 42T 2.80 +10.7% -10.7%
15T 43T 2.87 +12.8% -12.8%
15T 44T 2.93 +14.8% -14.8%
16T 38T 2.38 -5.3% +5.3%
16T 39T 2.44 -2.6% +2.6%
16T 40T 2.50
16T 41T 2.56 +2.4% -2.4%
16T 42T 2.63 +4.8% -4.8%
16T 43T 2.69 +7.0% -7.0%
16T 44T 2.75 +9.1% -9.1%


check the spec on 15/44

 

[cors187]

Put the 42 on today, went on fine after flipping the blocks. First ride tomorrow with the new gearing.

Gokes , do you mind if we merge your sprocket thread into the bigger sprocket thread?

 

[gokes]

Going full boldor
The real spec about it, is 10% torque.
It could be the best mod for the 690 power/weight

Front Rear Ratio Torque Speed
15T 38T 2.53 +1.3% -1.3%
15T 39T 2.60 +3.8% -3.8%
15T 40T 2.67 +6.3% -6.3%
15T 41T 2.73 +8.5% -8.5%
15T 42T 2.80 +10.7% -10.7%
15T 43T 2.87 +12.8% -12.8%
15T 44T 2.93 +14.8% -14.8%
16T 38T 2.38 -5.3% +5.3%
16T 39T 2.44 -2.6% +2.6%
16T 40T 2.50
16T 41T 2.56 +2.4% -2.4%
16T 42T 2.63 +4.8% -4.8%
16T 43T 2.69 +7.0% -7.0%
16T 44T 2.75 +9.1% -9.1%


check the spec on 15/44

Oh very interesting. Just did about 150 miles through mountain twisties and I like it. It's not world chaning, but it just lets you be in the optimal gear more often, and get more power down exiting corners.

Recommend.

Also finally experienced a couple of these mythical 3rd gear wheelies coming over bumps on acceleration.

Put the 42 on today, went on fine after flipping the blocks. First ride tomorrow with the new gearing.

Gokes , do you mind if we merge your sprocket thread into the bigger sprocket thread?

Sure no worries

 

[Boldor]

Everybody knows you never go "full Boldor"...

Freddie will not forget your lack of respect easily.

Full Boldor

 

[Wheelie 72]

Just changed to 15/42 today.
First impressions, I like it

 

[capsella]

related question... I got a new rear (46, keeping stock front) and hence a new chain, the chain came with a clip type master link. I know these are considered "ok" for dirt bikes, but is it safe to use on a duke?


thanks.
-Andrew

 

[sf_ds]

Yeah but...I wouldn't. It's a very torquey bike with lots of vibrations. Chances are it will be fine for the life of the chain, but a rivet master link is a few dollars and any moto shop should have them in stock. Worth the peace of mind. You can fit a rivet master link on your chain. Throw the clip on for now (if you can even get it on. I hate those f.ucking things so much) and go get a rivet style.

 

[capsella]

Yeah but...I wouldn't. It's a very torquey bike with lots of vibrations. Chances are it will be fine for the life of the chain, but a rivet master link is a few dollars and any moto shop should have them in stock. Worth the peace of mind. You can fit a rivet master link on your chain. Throw the clip on for now (if you can even get it on. I hate those f.ucking things so much) and go get a rivet style.

will do. Thanks

 

[kbradley0323]

Anyone experiment with a 17/38 combo? Looking to try and get a little more top speed out of mine.


Sent from my iPhone using Tapatalk

 

[Weldertron]

I believe Boldor tried to up the ratio, but barely got a few more kph, while making the bottom end garbage.

Do you have the evo setup?

 

[MikSane]

I went 16/42, flipped the adjusters and called it a day. Stock bike instantly powered up in 2nd. Clutch up in second feel like first on my grom. Cruise 80 on the highway all day. Great on my 2nd track day too. This is the perfect balance between stock and Boldor's settup

END OF DISCUSSION>

 

[michaelnel]

What is the length of the stock chain (number of links)?

 

[michaelnel]

Chain slack spec in manual seems very small... 5mm / .25" with the bike on a swingarm stand. Is that correct?

 

[michaelnel]

What is the length of the stock chain (number of links)?

Never mind, found it. 118 links.

 

[sf_ds]

Chain slack spec in manual seems very small... 5mm / .25" with the bike on a swingarm stand. Is that correct?

No, the manual lies to you. Don't believe anything it says. :hang:






Yes it's correct.

 

[michaelnel]

I guess part of it is that there is not that much travel in the rear end (compared to dirt bikes) and the resting position of the swingarm with it on the swingarm stand is almost level.

I do understand the chain is always tightest on any bike when the countershaft, swingarm pivot and rear axle are all in a line. Any other position, the slack increases.