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I've got one too. When I got it, I'd never even heard of Mantis, or Richard Cunningham. I thought that Gary Fisher was one heck of creative genius, for making all these bikes.

Mine's unrideable though, snapped the driveside chsty bolt. Buggers.

For a forum on such long-forgotten oldies, this is as good as it gets. And its pretty good, too. Only the brands with the biggest clut status seem to have enough follwers to justify a separate dedicated forum. I was pretty far along on a Trimble site, and realized there are about a dozen people left in the world that care enough to get online & find out more about em, & they're all here anyway, so...
 

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VRC Illuminati
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flyingsuperpetis said:
For a forum on such long-forgotten oldies, this is as good as it gets. And its pretty good, too. Only the brands with the biggest clut status seem to have enough follwers to justify a separate dedicated forum. I was pretty far along on a Trimble site, and realized there are about a dozen people left in the world that care enough to get online & find out more about em, & they're all here anyway, so...
LOL! That's funny...I was in the same place with a Slingshot site...
When far more mtb'ers on the trail say: 'what the hell bike is that!?'...you know your site traffic may be few and far between!
 

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mountaingoatcycles.com
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How about this for an idea?

If any of you guys want to ever write up anything for your favorite brand, we would be happy to give it a home. I know Shayne has given us some Mantis info. Maybe if it is available in one place, more people will use it. We are already reasonably well known as a source for older mountain bike info. Just a thought
 

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Discussion Starter · #8 ·
I've got problems adjusting a new front mech on a CR7!

Just fitted a newish XT front mech to the CR7 and I am having problems setting it up.

There does not seem to be enough outward through in the mech to move the chain to the outer (large) chainring. I have tried screwing the limit screw fully out but it still does not move the chain far enough across.
I also noticed that I had to screw the inner limit screw almost fully in to stop the chain dropping off the inside.

I know that the CR7 has a wide BB shell and BB axle so is this pushing my chainset too far out? Is it beyond the limits of the current Shimano XT front mech?

I am running an XT thumbie and even with it pushed right round the chain won't shift.

My crankset is quite old, it is a Suntour XC Pro one, circa 1992.

The BB bearings are pressed directly into the BB shell. They are then retained by a circlip each side. That's it, there are no other parts apart from the axle. The bearings are directly exposed so presumably when I replace they they need to be well sealed.

The BB and axle is the one that came with the frame. Not sure what length it is but I can check it tonight.

I have fitted been MTBing for 10+ yrs and fitted numerous front mechs but this one seems to be giving me loads of hassle.

Any thoughts or comments particularly from other CR7 owners would be appreciated.
 

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Mantis, Paramount, Campy
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I'd check the BB Spindle length first

That would be my first guess. If it the original spindle it is probably 127.5mm or longer. I run XC Pro cranks usually with a 118mm spindle sometimes shorter depending on frame clearance issues.

I wouldnt worry too much about the BB bearings unless they are giving you problems. I have several frames with a similar style press fit BB and have only replaced 1 set. Unless you ride in a lot of grimy/muddy water they will last for 10+ years
 

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First Flight said:
If any of you guys want to ever write up anything for your favorite brand, we would be happy to give it a home. I know Shayne has given us some Mantis info. Maybe if it is available in one place, more people will use it. We are already reasonably well known as a source for older mountain bike info. Just a thought
Jeff, in case you don't hear it enough already... Great site!!!! It's the best retro info site on the web.
 

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Discussion Starter · #11 ·
Where acn get hold of either a shorter axle or a older style crank?

I took the some measurements last night, here are the results.

Axle length 128mm
Bike centreline to middle chainring 60mm.
The clearance between the charinrings and the chainstay is pretty big even by Fisher standards.

Looks like I am either going to have to find a new shorter bb axle or a really old crank arm.
Any suggestions on how I can identify a suitable crank? Do I just have to fit it and measure the distance?
I am currently running a compact drive chainset which makes it even more complex.
 

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Mantis, Paramount, Campy
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Oh, XC Pro MicroDrive....

If its a MicroDrive crank then you probably need a 113mm BB. With that 128mm spindle I'm surprised you can even get the chain to the middle chainring!

Phil Wood and Action Tec have spindles available to fit your BB..

Your best bet for a crankset that will fit would be eBay. A Shimano XT, DX, or LX made 1992 or before would work as well as some of the early aftermarket cranks such as Cook Brothers.
 

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Discussion Starter · #14 ·
Probably going to get a new bb axle rather than crank

scant,

I am going to get a new axle if I can find one, I can then re-use my existing chainset.

CBR cranks might be cool for the retro look, don't think the CR7 is going to get a lot of miles anyway.

shayne,

I am over in UK, can you recommend any US shops that would stock a bb axle?

Thanks

Bas
 

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Mantis, Paramount, Campy
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You can order direct from Phil or Action Tec

They both have websites and you can purchase directly from them. An Action Tec titanium spindle will cost you $60-$70. I dont know what the prices of Phil Wood spindles are currently; the last one I bought was 6 years ago.
 

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Yup, Phil Wood is probably your ultimate source. They supply bearings, spindles to fit em, and of course the quality is top notch, and the cost reflects it. Precise, bombproof stuff.

Otherwise, you can look for my secret weapon of choice, Mavics conical-ringed BB. That sucker is the smoothest, best sealed, longest lasting BB in the world, and requires no threading whatsoever in the BB shell. In wi, where the weathers always wet, muddy, and miserable, and the hills are steep & many, those units have held up better than anyone elses BBs for over a decade, in every instance out of the shop. The fact that they'll fit any frame is an added bonus. They show up on ebay from time to time.

If you're going to keep using your microdrive setup & microdrive was based on a 50mm chianline, using a spindle width of 108 will drop 10mm off each side, and pull your rings back where they need to be. While you've still got your 128mm in there, make sure you have enough clearance between your cranks & your chainstays to afford taking 10mm out (per side) without clanking fresh exciting holes through your frame.

Can someone verify that Suntour MD was 50mm? My old MD kit is all packed up in a box back in Colorado.
 

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Mantis, Paramount, Campy
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You've had good luck with the Mavic BBs?

The 2 that I have owned have had very short bearing life and they are a pain in the ass to disassamble and replace.

The design is very usefull though as they are a great way to save a frame that has a stripped out BB shell.
 

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Yeah, major luck! Weird. Three of the biggest hardest guys racing through our shop got em when they were new, and have ridden em on their training rigs all these years, with no need for service. The only complaint was that they were too heavy to use on their race bikes. I wonder if there was a bad run or something...
 

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Discussion Starter · #20 ·
Anyone know the Action Tec web address?

I have looked in the manufacturers listing on this site but I couldn't find it.
Any help on this one would be appreciated.

Cheers,

Bas
 
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