Any New Opinions on 25 mm Spindles ?

Jeff Stamper

I did a search and found a post on 25 mm spindles. Its rather old and I was wondering if anyone can share any opinions on what they think of the difference between the two ? Thanks for any help ! I am trying to decide which ones to put on my new kart.
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Walt Gifford · Posted: Tue Dec 07, 2010 9:25 am Post subject:

The front end has to have some flexibility. If you have a very stiff chassis with a KT100 can motor I'd think twice. If you have a 30mm frame with no front torsion bar I'd go for 25mm.

Gif Cool

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Chris Livengood · Posted: Tue Dec 07, 2010 10:11 am Post subject:

I think they are a lot like the 17mm spindles, just 7mm larger. I'm not being cheeky.
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Jeff Stamper · Posted: Tue Dec 07, 2010 10:15 am Post subject:

Walt, I have a 28 mm chassis that is very flexible with a KT or a KPV. Think its worth it ?
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Jeff Stamper · Posted: Tue Dec 07, 2010 12:30 pm Post subject:

Thats sort of why I posted this ! I am not sure either. I can get them on the new kart, so I figure if nothing else, they may be stronger !
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Dan Haynes · Posted: Tue Dec 07, 2010 2:44 pm Post subject:

Tom Sekey · Posted: Tue Dec 07, 2010 3:29 pm Post subject:

Ran both on our PCR. If the track had low grip the 17's were faster. If the track had medium + grip the 25's were faster. 17's flex 25's don't.

Tim Koyen · Advertiser Joined: 26 Nov 2002 Posts: 1556

I like them on the Tag and in the rain, as it allows the front to be both wider and stiffer. I don't really see the necessity in Yamaha or KPV.
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Chris Livengood · Posted: Tue Dec 07, 2010 4:38 pm Post subject:

Mike Goebel · Posted: Tue Dec 07, 2010 5:43 pm Post subject:

Mike Goebel · Posted: Tue Dec 07, 2010 5:45 pm Post subject:

Jeff Stamper · Posted: Tue Dec 07, 2010 5:46 pm Post subject:

Mike Goebel · Posted: Tue Dec 07, 2010 6:09 pm Post subject:

Run the 25mm guys they won't bend as easy.

Just for fun we get the following deflections. I may be wrong but at least I'm drunk Laughing

17mm approx .004 in
25mm approx .0002 in

at a load of 200 lb and a distance of 7in from kinpin to center of wheel.

Mike G.
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Dan Haynes · Posted: Tue Dec 07, 2010 6:17 pm Post subject:

we got 17's on the X1 when we bought it. i ordered the 25's but they didn't come in until after our last race so we haven't had a chance to try them yet. but i've been told by several X1 drivers that you need the 25's in TaG.

EDIT-let me add that the times that we ran it with the 17's it had a very bad push the whole way through the turn. we couldn't tune it out no matter what we tried but we had older YKCs and not the greatest track conditions.
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