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in forks

I had a Vicious that was 438mm axle to crown.I don't know if that is considered production,however.Pace also made some shorter forks,if I remeber correctly.

dan
 

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SlingShot

Yunkie said:
Is there such a thing???
Slingshot production frames (BigShot, Big Single) were available in non-suspension corrected versions thru 2005. Not sure about the new 2006 models.
 

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I know you're probably aware, but the Monkey fork from Surly is 468, and would certainly give you a little slacker head angle. Still less than an inch from what you have now, so maybe it's not too much anyway...

Plum
 

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Thx Plum, that's exactly what I was wondering. Only question would be the leg to leg clearance. Although I did use a Porta Power to spread the current Vicious Cycles fork! The 468 might be just right, I'm also thinking Shiver SC for suspension.
 

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I am going to have a KM frame/fork for around the town as well, and I'm going to be moving farther north next summer, and the thought has crossed my mind about trying to fit the 3.7 surly tires in the KM frame.

I'd also be curious if the 3.7 tires would fit on a wider standard 26" rim, like a rhyno lite or something, as the large marges are quite the investment. I'm guessing with the exaggerated height of the 3.7 tires, the KM would still feel like it was on big wheels, but I'd have the floatation that the larger tires offer. I'm hoping that the narrower rims (if the tires would fit) would offer a little taller, narrower profile than the LM rims, and allow them to get through the normally spaced fork without issue.

Might a question best posed to the surly group, as these questions are all primarily fit issues between their components. Anybody try a 3.7 surly tire on a standard (not LM) rim?

Plum
 

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Rear triangle

Plum, your problem will be with the rear triangle. I took a stock Vicious Cycles 26 inch fork and used a Porta Power to spread the legs wide enough for the tire to fit (used a skewer to hold the dropouts stable). These Endomorphs are HUGE. Although they can be thought of as 29" OD, the sidewalls are 100mm wide (on Remo rims). I'll mount one on a Sun Single Track for you and measure the sidewall to sidewall if you want. However; a 32mm wide rim would bring the beads way to close together to support the width of the tires. You might get away with a DH wide rim like a Sun "Doublewide".
 

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Down South Yooper
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mtnbikerx said:
Plum, your problem will be with the rear triangle. I took a stock Vicious Cycles 26 inch fork and used a Porta Power to spread the legs wide enough for the tire to fit (used a skewer to hold the dropouts stable). These Endomorphs are HUGE. Although they can be thought of as 29" OD, the sidewalls are 100mm wide (on Remo rims). I'll mount one on a Sun Single Track for you and measure the sidewall to sidewall if you want. However; a 32mm wide rim would bring the beads way to close together to support the width of the tires. You might get away with a DH wide rim like a Sun "Doublewide".
That's funny, the 'Doublewide' Rim was the one I had in mind for this use, I think they're around 40mm or so. If you have the time, I'd love to see pics of an endomorph on a singletrack rim. I'm just trying to get away without building a LargeMarge wheelset that I can't use for another bike. The 'doublewide' rims I can put on my other 26" bikes with 'normal' size tires..

Plum
 

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82mm

The widest cross section is at the lugs / 82mm. This is mounted on a 31mm Singletrack rim. If you measure the sidewall cross section it is very slightly (maybe 2mm) narrower than the lugs. This down from 100 mm on the 82 mm wide Remo rim. If you have 86 mm between your seatstays and chainstays the Endos would (just) fit. Oh yeah, remember, these tires are as tall as a 29" tire. So you need to take that clearance into consideration too. The tire stands 370mm from axle CL to the top of the tread. You must have more than that from your rear QR centerline to the nearest obstruction. FD, BB, seat post, etc.
 

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So how does it feel?

How does the tire feel mounted up on the narrow rim, like it's going to fold over and off, or does it feel Ok with enough pressure? I can picture that at lower pressures, keeping the bead on the rim would be an issue.

Thanks for the measurements, I'll be writing those down and doing some measuring.

Plum
 

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Feels great, as shown it is about 20PSI. It's stiffer than the Endomorph at 5 PSI (doh) but it really feels fine. Be even better on the Doublewide rim.

UPDATE: I just scored a Shiver SC to throw on the FatBike --- I just can't help it!
 

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In my best german accent:

Interesting, veerry interesting.

Thanks for all the input and measurements, I'll be sure to keep the crowd updated if/when I bring it all together.

Plum
 
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