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General Category => General Discussion => Topic started by: Groover on September 08, 2021, 09:47:38 AM

Title: 40mm Fork Tubes
Post by: Groover on September 08, 2021, 09:47:38 AM

Considering using the 40mm Triples and fork lowers off a LM1000, but on an older Tonti frame with the shorter steering tube and don't want them to stick out on top so much. What are my options in this case, considering the cartridges inside would also need to be different as well, correct?

Title: Re: 40mm Fork Tubes
Post by: Stevex on September 08, 2021, 11:08:31 AM

Have you thought about fitting Showa cartridges to the oem forks?

Title: Re: 40mm Fork Tubes
Post by: Groover on September 08, 2021, 12:16:49 PM

Thanks for the response Stevex. I am open to suggestions. Where can you get the showa cartridges'? Was thinking of reaching out to Franks Forks in regards to the 40mm question, but still confused on how the cartridge would be handled even if the tubes could be shortened. Hopeful to hear some answers here as I'm not quite yet ready for this project so these are just thoughts I'm working through.

Title: Re: 40mm Fork Tubes
Post by: guzzista on September 09, 2021, 12:03:31 AM

Years ago I had a  LM 40MM fork I wanted to adapt to a short neck Tonti so my plan  was to swap the steering stem from a short neck triple  onto the 40mm lower triple , assemble everything and then measure what if any length would be  needed to shorten off the tubes.
As for cartridges, if I am not mistaken a 39 mm damper assembly from a 1990's Honda VFR ( showa?) could be made to work ( lots of those around cheap). You might need bespoke springs, but Sonic Springs would have that covered.  Hope this is some more food for thought.

www.sonicsprings.co m

Title: Re: 40mm Fork Tubes
Post by: Groover on September 09, 2021, 08:29:03 AM

Great info Guzzista, this gives me a direction. Very much appreciated. Thanks!

Title: Re: 40mm Fork Tubes
Post by: guzzista on September 09, 2021, 11:52:35 AM

One more thing to keep in mind are the fork legs. Both 270mm and 300 mm rotors can be used on the LM  40 mm forks. So either matching the rotors to the type you have  or make adaptor plates for the calipers ( for 300mm rotors) may be required

Title: Re: 40mm Fork Tubes
Post by: Groover on September 09, 2021, 12:29:33 PM

Is the rotor mounting bolt pattern the same between an LM3 front rotor and the LM4 (I say LM3 because of the 180mm fork spacing)? I understand the caliper will need the adapter to push it out for the 300mm.

Title: Re: 40mm Fork Tubes
Post by: guzzista on September 09, 2021, 06:47:05 PM

LM 850/LM2/CX100 LM3 as well as T, T3.T4, G5, Vert all have a 6 hole rotor  bolt pattern, LM4  and  later others, 5 hole bolt pattern. The fork spacing is 180mm on  LM3/ 4,5, 1000  so axle / spacing will only be affected by which  wheel you decide to use

Title: Re: 40mm Fork Tubes
Post by: Groover on September 09, 2021, 09:02:53 PM

Ok thanks again. I should have known that (bolt pattern).