Biggest fork tubes?

[Pete.]

I need to source a single fork tube (the chome/nitrided slider bit) for a non-bike-related project. It's got to be perfectly straight and good finish and as large as possible in diameter. What bikes have the largest diameter tubes in the forks? I'm looking for a minimum of 42mm ID but ideally I'd like at least 46mm.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[CaNsA]

1200 Bandits used a 43mm unit and 1250 Bandits do too.
01-04 FZ1 Yamaha's use a 43mm unit also

46mm
SV1000 not sure which year though.
ZX6R 98-02
ZX9R 98+

[Kickstart]

Hi

Looking at the ABE catalogue at the dimensions, the KTM 620 Duke from 1998 with a 50mm o/d fork, which is the largest I can find. MV F4 might be easier to find has a 49mm o/d.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Wafer_Thin_Ham]

MV Agusta F4 1000S uses a 50mm fork. Fairly sure there's a special edition that goes up to 53mm. EDIT-Damn you Keith.
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[Pete.]

Are we talking OD of the top sections of USD forks or OD of the sliding tubes? I'm after the largest diameter sliding tube.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Wafer_Thin_Ham]

[Kickstart]

Hi

Those are the dimensions of the fork tubes (ie, chromed bit). Can double check for most of them against the fork seal size on Wemoto.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Vincent]

GSXR1000 K4, (2004?), stanchions, (sliders), up are 46mm I believe. Should be a few used ones around I reckon.
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[Nick 50]

Can i ask what it is for, would something else not work? Hydraulic Actuator perhaps??
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Current Bikes: ZX7r 97 (Black Beauty), VFR400 NC24 (The banana)
Previous Bikes: Aprilia Tuono 03 (The Beast), CBR600f (97)
First bike: A GZ125 Lemon.......

[Wafer_Thin_Ham]

[Kickstart]

Hi

Looks like a few others might use 50mm fork. Ducati Hypermotard and the Bimota DB10 both seem to use a 50mm Marzocchi fork. However these are probably new enough that finding a spare fork will be expensive.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[sidewinder]

Wouldn't motocross bikes have large ones?

[Vincent]

What's it for Pete? Would a vacuum cleaner pipe do it?
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[Wafer_Thin_Ham]

[Pete.]

[Az]

[Pete.]

[Kickstart]

Hi

I would be a bit unsure that he inside of a fork is finished to anything like an accuracy of 1 thou. I would think for bike use the finish there is fairly irrelevant so little effort would go into making it accurate.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Nick 50]

What about hyrdaulic honed tube?

https://www.indiamart.com/gpmhydraulics/hydraulic-honed-tubes.html

"Internal Roughness:Ra value 0.2 - Ra 0.3 (Micron)"

That would be way smoother than a fork imo
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Current Bikes: ZX7r 97 (Black Beauty), VFR400 NC24 (The banana)
Previous Bikes: Aprilia Tuono 03 (The Beast), CBR600f (97)
First bike: A GZ125 Lemon.......

[Pete.]

[Pete.]

[kramdra]

A fork stantion is not going to be anywhere near that tollerance espeically a used one However having a straight-ish bit of tube to begin with probably saves some machining costs or effort from the project?


Intresting project.. please post a thread about it.

[Suntan Sid]

Have a look at this!

https://scandalon.com/2009/06/motorcycle-fork-diameter-chart/

Hope it helps.
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[daemonoid]

[Pete.]