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Lauf Grit on Kona Rove 2014

by jurth
Tue, Sep 03, 2019 21:21
4

Hey.

 

I'm considering getting a Lauf Grit SL fork (https://www.laufcycling.com/product/lauf-grit-sl) for my Kona Rove 2014 (http://2014.konaworld.com/rove.cfm). I’m trying to figure out if it will change the geometry too much.

The Rove fork has an axle to crown measurement at 403 mm. The Grit is measured to 411 mm, but according to Lauf the characteristics of the fork means it behave like a 395mm fork. So this means a fork change might change the geometry more than I would like. However the headset change might have an influence (I apologize if I get the terminology wrong, i’m new to understanding headsets).

Kona have a FSA NO. 11 internal headset (https://shop.fullspeedahead.com/en/type/headset-spares/no-638), and I need to change headset to with zero stack top and external cup lower. This means that lower cup now sits outside the headtube, and the height of that should be added to axle to crown, then comparing the geometry, right? Is there a common height of an external cup, or does that alter between headsets, and in that case what is that measurement called?

The next question, is what headset would fit. I did my best to figure what type of headset I need using the SHIS standard. I should be: ZS44 / 28.6 | EC44 / 40, does that seem right?

The last question, the rake is 45mm of the Grit (effective, according to Lauf) and 43mm of the Kona fork. Is that a change you would actually notice?

 

Hope you can help me decide what to do.

 

Best regards, 

Jonas

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4 comments

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bechdan | 5 years ago
1 like

Yeah best measure the internal headtube size

Sorry yes for some reason I didnt think of an external lower headset cup. I would imagine your current upper would be fine.

Cane Creek website has a headset finder section that should give you the right size items you need.

As you say, having an external cup will increase headtube length (perhaps 1cm?) and increase the head angle / raise the BB - however this will be fairly small amount.

Certainly removing one or two spacers would keep the bars in the same position, and just get used to the slightly different geometry, you may not even notice it over the change of fork.

 

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jurth replied to bechdan | 5 years ago
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bechdan wrote:

Cane Creek website has a headset finder section that should give you the right size items you need.

Found the headset finder at Cane Creek sites, that is a great resource, thanks.

bechdan wrote:

As you say, having an external cup will increase headtube length (perhaps 1cm?) and increase the head angle / raise the BB - however this will be fairly small amount.

After a little research I figured that the measurement I need to look at, is lower stack height. My current headset is 3mm, and an example of bottom cup that should fit is Cane Creek Forty, with a lower stack height of 12mm, so the difference is 9 mm. So with that, the effective A-C + added stack of the Grit should be 404, so it seems to be a perfect fit for my bike, if I like to keep the geometry the same 1

 

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bechdan | 5 years ago
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I dont know if Im looking at something different but the size is 409mm A-C length with 6mm sag.

The rake is 47mm on the Lauf and 43mm on the Kona, so not much change but should be favourable for the intended terrain

 

BUT as far as I can see the fork is a tapered 1.1/8-1.5 whereas the kona headtube is a straight 1.1/8 so you wouldnt be able to use it

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jurth replied to bechdan | 5 years ago
0 likes

bechdan wrote:

I dont know if Im looking at something different but the size is 409mm A-C length with 6mm sag.

The rake is 47mm on the Lauf and 43mm on the Kona, so not much change but should be favourable for the intended terrain

You are right, the Grit A-C is 409mm, my bad. But I think I need to it measure up against their effective measurement, I guess it adds fork sag into the equation. This means 403 vs. 395.

 

bechdan wrote:

BUT as far as I can see the fork is a tapered 1.1/8-1.5 whereas the kona headtube is a straight 1.1/8 so you wouldnt be able to use it

Are you sure?, my headtube is a straight 44mm (as far as I can tell, I might need to measure it). 1.1/8 in the measurement of the current headset (which I would change). An example of a bike that has a 44mm straight headtube, and can be supplied with a Lauf Grit (and thereby a tapered 1.1/8-1.5 fork) is Otso Warakin (https://otsocycles.com/products/warakin-custom-bike-configurator).

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