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bmx to minivelo questions

 
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elzie5000
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PostPosted: Mon Mar 23, 2009 2:34 pm    Post subject: bmx to minivelo questions Reply with quote

I've got a spare bmx frame that I'm thinking of converting into something mini-velo-ish.

My questions:
Are there 30.8mm seat posts that are 450mm or longer? The longest I can find are 410mm.

If I was going to run a 3/8" axle in 14mm dropouts, would I need some kind of adapter to fill the extra space, or would that not be an issue?
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sailorjames
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PostPosted: Mon Mar 23, 2009 3:57 pm    Post subject: Reply with quote

I just searched J&B and Trek's inventory and see nothing above 400mm
Looks like Thomsons can come as long as 410mm though.

I also think the axle would need to be big enough to fill the dropouts. I've never tried it myself, but I'd think you may have some problematic flexiness in the wheel if the axle didn't fit in the dropouts properly.
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elzie5000
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PostPosted: Mon Mar 23, 2009 4:24 pm    Post subject: Reply with quote

I think the axle could be shimmed without too much trouble, but if I can't find a long enough seat post the project is a no-go.
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bryant
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PostPosted: Mon Mar 23, 2009 4:43 pm    Post subject: Reply with quote

there are several companies that make 14mm to 3/8" adapters. you can probably find one from a mail order bmx company.
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jdbaum3
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PostPosted: Mon Mar 23, 2009 6:35 pm    Post subject: Reply with quote

harris cyclery has QBP's online catalog up under special orders, so if they don't have it and trek and J&B don't have it then it's going to be pretty much a no go unless you happen to freakishly find some old one on ebay.
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bryant
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PostPosted: Mon Mar 23, 2009 8:37 pm    Post subject: Reply with quote

i hate dans comp about as much as anyone but for something as small as this i dont see any harm in ordering it from such a lame company. just did a quick look to see if they still sell them. theyre just one state over and can get them to you quick. if you want to support a mail order company that doesn't suck as much try albes

http://www.danscomp.com/440015.php?cat=PARTS
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elzie5000
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PostPosted: Mon Mar 23, 2009 9:28 pm    Post subject: Reply with quote

Thanks for the link Bryant.

Harris/QBP has two 450mm suspension posts in a smaller diameter, but the max height is still too low.

I think I need to wait and get a real minivelo frame.
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jdbaum3
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PostPosted: Tue Mar 24, 2009 2:36 am    Post subject: Reply with quote

speaking of smaller diameters, did you look into finding the right length and shimming it?
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elzie5000
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PostPosted: Tue Mar 24, 2009 8:06 am    Post subject: Reply with quote

Yep.
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themanmachine
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PostPosted: Tue Mar 24, 2009 11:19 am    Post subject: Reply with quote



I'll test it out for you if you buy it.
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themanmachine
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PostPosted: Tue Mar 24, 2009 11:28 am    Post subject: Reply with quote

Also, this might be relevant to your interests:



http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=150333768868
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elzie5000
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PostPosted: Tue Mar 24, 2009 11:45 am    Post subject: Reply with quote

The Silgey is what got me thinking about minivelos in the first place.

That and:
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stringa
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PostPosted: Tue May 26, 2009 2:31 pm    Post subject: Reply with quote

When I made mine I used EMT conduit and an old-style seat clamp, then welded a brace from the post to the headtube/toptube junction. Probably more labor intensive than you're looking for, but it's stiffer then a priest in a brothel.
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