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Old 09-12-09, 02:02 AM   #1
rekall
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convert 3x7 to 1x7?

before i decided on and got my jamis trail xr (with no regrets) i saw several 'cheap' (box store i.e. walmart) mountain bikes in the junior category (24") that were 1x7's with no front derailleur but instead a dual chain tensioner in its place... it seemed such an elegant design that i can't get it out of my head now many months later.

what would be involved with ridding a bike of its FD and going to a 1x7? so many accessories, and weight, and complications, would be lost in favor of simplicity... front derailleur, two chainrings, left shifter, shifter cable, etc. and then i'd only have to worry about keeping the rear derailleur in top working order.

(and i'd probably ditch the front brake, too. so on the handlebars i'd have just the brake lever for the rear v-brake which provides Plenty of stopping power as-is, on the left, and the shifter for the RD on the right.)

anyone familiar with the blackspire stinger or dwr chain reactor? both are chain tensioners that mount to the drive side of the bottom bracket.

also, what are my options when it comes to the drive side crank & spider? ideally i'd like to upgrade the 42t outer chainring of the triple set to just a single chainring, 44t (more gear-inches).

ideas? advice? links? any and all information would be awesome.
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Old 09-12-09, 03:45 PM   #2
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Originally Posted by rekall View Post
advice?
Leave the front brake on.
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Old 09-12-09, 04:52 PM   #3
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It is not just cheap bikes that you find configured w/o front derailer. Redline puts out a 29er configured as a 1x9. Haro put out at least one 1x9 bike this year as well.

FWIW, I agree w/lubes -- keep that front brake. I can't imagine riding w/o one.
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Old 09-13-09, 01:11 PM   #4
rekall
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yeah i'm on the fence on that one. i do have recent memory of my ride to/through wilmington of the many hills with both hands firmly pressed on both brakes on all descents. don't think i would have felt as safe if it was with a single brake. it's there might as well leave it on.

is there such a thing as a freewheel->freehub adapter? a freehub body that'll thread onto a freewheel hub? obviously it wouldn't have the benefit of the better/more fluid ratcheting mechanism, but...

Last edited by rekall; 09-13-09 at 08:11 PM.
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Old 09-14-09, 07:19 AM   #5
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Your front brake applies something like 80% of your braking force. When I'm on the trail, my rear brake doesn't ever stop me, it's only good for scrubbing a little speed into a corner. If anything, it's your rear brake which is expendable, not the front one.
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Old 09-14-09, 08:52 AM   #6
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As above, your front brake is by far the most importna,t especially for trails.
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Old 09-14-09, 09:42 AM   #7
rekall
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so anyway... about my question in bold and in general the conversion i'm about to undertake...
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Old 09-18-09, 11:41 PM   #8
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shelving this project for the time being on account of today's ride from trenton to ledgewood on 206 north and whoa yeah you better believe i put all three chainrings to work
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