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Discussion Starter #21
Want the the fork measurement on centers or on the inside of each fork
Inside each fork (not from center) at both the fattest portion where upper and lower meet, and at the axle please. Also, may as well ask the question for grom since you have one there...what is the centerline distance (you haven't given that yet) as well as the tree offset?

If there is enough clearance, I may just find myself a set of grom forks and use a set of KKK Product Trees and call it a day and update the forks if needed later.
 

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Inside each fork (not from center) at both the fattest portion where upper and lower meet, and at the axle please. Also, may as well ask the question for grom since you have one there...what is the centerline distance (you haven't given that yet) as well as the tree offset?

If there is enough clearance, I may just find myself a set of grom forks and use a set of KKK Product Trees and call it a day and update the forks if needed later.
Well these specs are questionable accuracy. With the head light cluster and all the other stuff in the way it was hard to get a fairly accurate measurement

The lower right Triple which is fairly accurate it's the same distance as on top of the triple

ForumRunner_20151204_014328.png


Same with upper Triple it was easier not only to take a measurement but also easier to get a clear picture. The distance is the same on the bottom side of the top Triple
ForumRunner_20151204_014556.png i eye-o-metered the inside of one leg to get this --->
ForumRunner_20151204_014738.png

Inside to inside of tire
ForumRunner_20151204_014900.png


Wasn't sure what offset you wanted the wheel spacing offset or if the bottom of the leg holes where offset. I made assumption you where looking for the hole at the bottom of the leg? If not let me know exactly what offset your looking for.
ForumRunner_20151204_015000.png
 

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Discussion Starter #23
Thanks again. I think i have all I need at this point but it's hard to tell in one of the pictures what the measurement is...it is the first one...i can't tell where I should look on the tape. That one is the center to center of the forks measurement right? I suppose you can take that from anywhere...tree, forks in the middle, or even at the bottom..the important thing is that it is center line of the forks to ccenter line of fork...and based on angle, it looks somewhere between 7 and 7.5 inches.

To effectively work on a ct that measurement will need to be over 7" and under 7.5...which could be...can you confirm...no picture needed...just the number...picture if you have the notion...
 

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Be sure to keep in mind the axle location on the fork bottoms. The Groms are on fork centerline, while the Zokes/Fast Ace are forward of the axle. This needs to come into play when planning your custom triple offset. If you install a set of Zokes on the standard Grom triple offset, it will shorten your trail (by moving the axle forward) and has the potential to make the bike more sensitive to bar input (twitchy). To have the same trail as stock, you will have to make the offset of the triples shorter the same distance that the Zoke axle location sits off of centerline. This may also cause contact issues of the forks with the tank or frame at full lock.

I can see why the Grom has the axle on centerline of the forks. If they are using triple/steering head geometry similar to my X4, they did this to make it more stable at speed. My X4 was twitchy on the freeway in stock form.

Also, not sure if Fast Ace stopped selling the 650mm forks. I purchased a set last Fall with no problems.

I am also interested if someone could measure the steering head angle on the Grom.
 

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top clamp 45mm
bottom clamp 48
distance from top cap to the highest point of 48mm clamp area is 150mm
straight area of 48mm is 80mm long
at fork seal is 51mm
drop out width is 39mm and looks to be centered.
 

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Discussion Starter #26
Perfect...these dimensions are the same for Fast Ace which I'm going to be buying a pair of in addition to my KSR110 forks. I'll reverse engineer the clamp distances shortly and post for CT70.

top clamp 45mm
bottom clamp 48
distance from top cap to the highest point of 48mm clamp area is 150mm
straight area of 48mm is 80mm long
at fork seal is 51mm
drop out width is 39mm and looks to be centered.
 

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A quick measurement in the garage looks like it will have the Zoke forks at 20cm on center to fit the Grom front wheel and spacers. That will leave a little over 14.5cm between the insides of the fork seal area for tire clearance.
I'm going to try and get into work next week and start drawing things up.


Any suggestions on offset changes for street use versus standard offset for dirt on the KLX?
 

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I am also putting grom forks on a ct70. The problem I ran into is the CT stem is longer.If you use the Grom lower triple with a CT stem the top clamp will not reach down to the top of the forks. Also the ride height is about 3 or four inches too tall. FYI the Grom forks centerline dimension is 204 mm.
 

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Discussion Starter #31
I am also putting grom forks on a ct70. The problem I ran into is the CT stem is longer.If you use the Grom lower triple with a CT stem the top clamp will not reach down to the top of the forks. Also the ride height is about 3 or four inches too tall. FYI the Grom forks centerline dimension is 204 mm.
Well, we all knew that the stem was going to be too short, so that needs to be swapped. For the height, it might work out actually. The stock grom forks are way too soft. So, you can effectively shorten the grom forks and retain or slightly trim the stock springs and you should be in business. Problem is I don't know how far you can shorten the legs until they bottom out.

I ended up using a set of ksr110 forks on one bike and a set of fastace forks on another. On both, I ended up sliding the forks up in the tree about 1/2" and then also adding 1" to the rear shocks. Work great!
 
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