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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-13-14, 02:06 AM   #1
ahornbaker
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120mm Front Disc Hub for Bolted Cog on Track Frame?

A couple months ago I built my first fixie as a $50 Build-A-Bike out of used parts at a donation/volunteer bike shop. Earlier this week I was messing around on my bike and broke the cog/lockring setup and stripped the hub. Recently, I've been buying parts to build a fixie from scratch, and I've almost ordered all the parts, but I've been holding off on buying the rear hub because I want to do a 6-bolt cog setup with a front disc hub rather than a lockring.

The frame I ordered is the Aventon Mataro framset (not the Mataro Low), and although it is not stated on the website, I've searched around and found the spacing on the front and rear are 100/120mm respectively, which seems consistent with modern track frame spacing. However, I cannot find a front (or rear) disc hub that is 120mm. Because I can't bend the aluminum frame to fit the hub, how can I mod a hub to fit the frame? Are there spacers I can put in to make up the extra 20mm?

I've been holding off on buying the rest of the wheel parts so that I can place one order on prowheelbuilder, so any solution that would be available from that site would be appreciated.

Thanks!
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Old 07-13-14, 02:25 AM   #2
natzoo
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I am not sure there is an easy way to add spacers. The problem is not the width of the hub, but rather the length of the axle. You cant just space out the axle, because that is what is holding the wheel in the dropout.

Sure, im sure you can get something to work, but is it really worth it? I am sure it will give you more problems than a cog and lock ring. Just invest in a good quality cog and good lockring and be careful when installing it...
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Old 07-13-14, 06:17 AM   #3
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Since I have a couple Velosolo disc cogs that I occasionally use on one of my mountain bikes, not too long ago I had the same idea but ended up letting it go. I cannot remember off the top of my head if Velosolo themselves offers a disc hub with rear track spacing but you might want to check there.

Then, if you don't mind spending big or waiting awhile...I am pretty sure that White Industries & Paul Components offer 120mm disc hubs, Mack will surely build one; and if I'm not mistaken, our own Sixty Fiver's company makes such things, doesn't it?

Or a less expensive solution to your quest that should not be very hard to get is Broakland's Disc adaptor that works on any fixed rear hub.

Good luck and I look forward to seeing other suggestions & what you end up with, as that may reignite my own interest in it...
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Old 07-13-14, 07:55 AM   #4
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If you are just scared of threaded cogs, white industries makes a track hub that uses splined cogs. You might check that out.

Another problem you will have using a front mountain hub is axle diameter.
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Old 07-13-14, 10:43 AM   #5
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Quote:
Originally Posted by IAmSam View Post
Since I have a couple Velosolo disc cogs that I occasionally use on one of my mountain bikes, not too long ago I had the same idea but ended up letting it go. I cannot remember off the top of my head if Velosolo themselves offers a disc hub with rear track spacing but you might want to check there.

Then, if you don't mind spending big or waiting awhile...I am pretty sure that White Industries & Paul Components offer 120mm disc hubs, Mack will surely build one; and if I'm not mistaken, our own Sixty Fiver's company makes such things, doesn't it?

Or a less expensive solution to your quest that should not be very hard to get is Broakland's Disc adaptor that works on any fixed rear hub.

Good luck and I look forward to seeing other suggestions & what you end up with, as that may reignite my own interest in it...
I found this site that seems to offer at least one setup for a bolted cog. Here is a link to a hub that seems as though it was made specifically for this purpose:
VeloSolo Shop - Converted Disc Mount Hubs and Hub Parts
If this works, the only questions I have now are how do I determine my chainline and accommodate for it with spacers (and will spacers mess up the axle spacing), and how do I know what length of spokes to get for this hub? They have a 41 and 46mm chainline option for this hub, which seems to be determined by the spacers. The crankset I have shipping is the SRAM S300 48T if that has any relevance to the chainline.
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Old 07-13-14, 11:43 AM   #6
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Why reinvent the wheel, literally? I get it if you're converting a mountain bike, but why go out of your way to do this on a purpose built fixed gear bike when there are many excellent and reasonably priced options available that will work out of the box with no modifications?
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Old 07-13-14, 07:26 PM   #7
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Why reinvent the wheel, literally? I get it if you're converting a mountain bike, but why go out of your way to do this on a purpose built fixed gear bike when there are many excellent and reasonably priced options available that will work out of the box with no modifications?
Because sometimes the journey is as important as the destination. He'll decide himself when it all gets too silly ... and might just have a working bike when it happens.
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Old 07-13-14, 08:04 PM   #8
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Because sometimes the journey is as important as the destination.
Exactly. +1000
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Old 07-14-14, 05:18 AM   #9
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I've almost done that. Still ride that wheel. I got a 100mm front disc hub, some Shimano job, changed the axle with something out of my parts bin that had the same threading as the original but the correct length and added spacers for the correct OLD. This allowed me to use the original cones and bearings. I wanted 130mm because I was converting a 130mm road frame. I had to mess around with which spacers were on which side to get zero dish. The chain line ended up at 46mm, which suited me fine because I was using the outer ring of a road double.
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Old 07-14-14, 05:51 PM   #10
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chainline

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Originally Posted by ahornbaker View Post
The crankset I have shipping is the SRAM S300 48T if that has any relevance to the chainline.
should be 42mm +/-

http://www.fixedgeargallery.com/arti...mson/surlyhub/


Several threads about this on the forum, do a search.
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