I am currently building an ironhead into an S120 frame. I want to run my original 35mm forks but am having a difficult time finding the right triple trees. The S120 frame has a big twin neck and so none of the 35mm trees I have tried have a stem long enough. I know I can't use a stock Sportster Triple tree, but so far I have tried two different FX trees: http://www.jpcycles.com/product/230-544 and http://www.jpcycles.com/product/230-463 and neither have had a long enough stem. Could someone point me in the right direction of what year bikes had 35mm lower trees with a stem long enough for a big twin neck? Just a rough estimation to me it looks like I need a stem about 9 inches long.
Triple Tree Help
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Its a paughco Frame with a big twin neck, so I used these big twin neck cups: http://www.motoparthub.com/24_0231_V...9KkxoCtKXw_wcB
I hadn't thought about the neck cups as being the problem though. I didn't realize that there were different types of neck cups for Big Twin necks.Last edited by Penguin74; 06-05-2017, 7:28 AM.Comment
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Its a paughco Frame with a big twin neck, so I used these big twin neck cups: http://www.motoparthub.com/24_0231_V...9KkxoCtKXw_wcB
I hadn't thought about the neck cups as being the problem though. I didn't realize that there were different types of neck cups for Big Twin necks.
Those cups look very thick but it's hard to tell by a pic... Those should work by there description.... I wish I could be of more help...Comment
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Do you remember what lower tree specifically? Like I said I've tried a few different ones that I would have called Vtwin tree's and they all have been too short.Comment
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Well my lower tree was for 33.4mm forks - http://www.jpcycles.com/product/230-468
So you will need a lower tree for 35mm. I think its important you get some factory oem part numbers for the lower tree. You need to reference a big twin model that has 35mm triple trees. If you do a little research (ill be able to help with this later im at work at the moment) you can find a model with 35mm forks and get the part number for the entire triple tree from a factory parts manual. Once you have that part # you can reference JPCycles / Vtwin / Ebay to buy the correct tree. In some instances the top tree is the same on both big twins and sportsters but i cannot say whether this is true in all cases. The sportster and big twin use different attachment methods for the top and lower treesComment
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Well so thats how I landed on the two triple trees I have tried so far. The research I could come up with was saying FX models 71-84 would have the right trees I would need. I found an FX parts catalog and came up with the part numbers 45608-77A and 45608-84 and those are the ones I've ordered from J&P with no luck. I am not sure of what other big twin models ran 35mm forks to look for more part numbers.Comment
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Well so thats how I landed on the two triple trees I have tried so far. The research I could come up with was saying FX models 71-84 would have the right trees I would need. I found an FX parts catalog and came up with the part numbers 45608-77A and 45608-84 and those are the ones I've ordered from J&P with no luck. I am not sure of what other big twin models ran 35mm forks to look for more part numbers.Comment
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I'll get some pics uploaded tonight. I haven't spoken with Paughcho but unless their neck cups are significantly slimmer than the ones I've used I don't think that would make any difference. A big twin neck should be a big twin neck no matter what frame it is hooked to.Comment
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Yep, There are so many different set ups and without really seeing pics of what he is using it's hard to give good advice...Comment
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