690 gearing thread. 15-42(boldor special) vs 16-45 - KTM Forums: KTM Motorcycle Forum
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post #1 of 45 (permalink) Old 11-12-2016, 03:22 PM Thread Starter
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690 gearing thread. 15-42(boldor special) vs 16-45

So beating this poor horse again.
From my understanding 15-42 gearing is what everybody loves to run, which makes sense.
But from what I've read, 16-45 gearing is almost exactly the same compared to 15-42.
So, the big and simple question, is why does everybody buy a 15 tooth front and a 42 tooth rear, instead of just buying a 45 tooth rear and only change one sprocket?
More teeth on the front, one less sprocket to buy and switch out, I don't see the downside?
Is the chain not long enough to fit over a 16-45?


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And yes this deserved another entirely new thread about gearing.

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post #2 of 45 (permalink) Old 11-12-2016, 09:53 PM
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I believe if you switch the tension blocks around you can just fit it with the stock chain.
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post #3 of 45 (permalink) Old 11-14-2016, 04:45 PM
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I was the Bloke who takes credit for first messing with final ratios on this forum.

When gearing down, my first step was to buy a 15 front because it was cheaper than a bigger rear. I liked the initial result but wanted more gearing down so I was forced to buy a bigger rear because putting a 14 on the front bothered me. If I did it again, I would just have bought a 44 or even a 45 for the rear. I have suggested that this is the way to go, but the 15/42 concept has kinda stuck.

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post #4 of 45 (permalink) Old 11-17-2016, 03:30 PM
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So...before I order the 45T, will it fit with the 16T front sprocket? Anyone try it, or am I going to be the guinea pig?
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post #5 of 45 (permalink) Old 11-17-2016, 05:51 PM
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42/16 barely fit with adjusters flipped and stock chain. 16/45 no way with out adding links.
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post #6 of 45 (permalink) Old 11-17-2016, 05:55 PM
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So...before I order the 45T, will it fit with the 16T front sprocket? Anyone try it, or am I going to be the guinea pig?

I am not sure that NJD has the right end of the stick there. But I cannot refute him because I don't run the stock chain any longer - it's gone. Either way, if you get the 45 and you have to later buy the 15 front, it's no biggie. The 15 is as cheap-as-chips even here in Australia. I guess you'll be running 15/45 which is lower gearing again, but if the bulk of your riding is about town, you'll like it even more too!

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post #7 of 45 (permalink) Old 11-17-2016, 06:06 PM
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Maybe is misunderstood the question. But if I'm right. your gonna need a chain.
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post #8 of 45 (permalink) Old 11-18-2016, 09:52 AM
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I ordered the 45 and the 15. I'll let you know the outcome. I might have to order a new chain too.
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post #9 of 45 (permalink) Old 11-18-2016, 10:11 AM
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15/45 is going be like a trials bike. Wheelie monster to the max.
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post #10 of 45 (permalink) Old 11-18-2016, 10:30 AM Thread Starter
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15/45? top speed of like 80mph?

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