20 inch rear wheel with 7-9sp cassette and disc tabs?

[mwkeefer]

Hello all,

Im wondering if there is anywhere a 20" rear wheel (built) with between a 7-9sp freewheel or cassette and disc mount tabs could be purchased outright?

Im looking to replace the rear wheel on several folders with disc compatible hubs and before I go about building my own or having the LBS do the build for me... I figured I'd ask the experts if there was a reasonable place to just purchase such a wheel pre-built.

Thanks in advance!

-Mike

 

[evblazer]

2 Recumbent stores I have used seem to have stuff. Just make sure what 20" wheel you have. THere are 406 and 451(?) that I have seen most commonly for folders and recumbents and often times both will fit on the same bike.
Calhoun Cycles
http://www.calhouncycle.com/productcart/pc/viewCategories.asp?idCategory=114

Hostel Shoppe
http://www.hostelshoppe.com/cgi-bin/search.pl?category=609500

Careful of the Capreo. It is a special hub that does allow a 9 tooth cassette but you can only use special high priced cassettes to replace it unless you are handy with hacking cassettes together. then again I don't think they have a disc compatable one at least not last I looked.

 

[johnrobholmes]

20" with disc? Not very common at all except maybe trials bikes. Trials only run one gear though. Easy to build though.

 

[geekybiker]

I'd check the various folding bike pages.

Dahon Jetstream has what you're looking for, but its a dual-drive system.

 

[mwkeefer]

Hey all,

Thanks for the quick feedback...

I checked the first URL out but those 20" wheels are all fronts (with disc mounts)... and sadly the capreo is not just propriataty but has a rather extreme price tag associated with it...

Yes the Dahon Jetstream has the right type of wheel but... if I wanted a dahon I would just buy one = )_

Seriously... there must be a way to do this, I was just at the LBS and measured up the rear on a 7sp kids 20" bike... 112mm bolt to bolt with huge space on the disc side and 7sp freewheel on the drive side... if only it had disc bosses it would be perfect.

Im beginning to think the best solution would be a BMX style ticktac hub with left handed threads and a thread on adapter for 6bolt iso - in terms of using off the shelf parts...

I've never built a 20" from scratch, thought I've done 26 and 700c rims aplenty... Im wondering if I can't just use a 26" 120-125mm rear hub (28-36 spoke) and simply lace it to a 20" double walled, machined rim? JRH any suggestions or comments on this?

The folders I am converting over are:

downtube 8H (internal SA8(w) rear no disc bosses, front sus)
downtube 8FH (internal SA8(w) rear, full sus)
Downtube Nova - 20", 24lbs folding bike with 130mm rear clearance
Downtube 9FS (9sp cassette rear, 135mm clearance)

All are 2009.5 models and only the 9FS has > 130mm clearance, nova coming in second with 130mm dead on and the other 2 have an unknown clearance (enough for the SA8 thought to be sure).

The game plan will be to make my builds (ie: for me) with the Astro 3210 and a Tower Pro 5330 for testing purposes (the 8FH and the 9FS) and for the remainder I have a few custom rewound RC motors with a 130kv and approx 88% efficiency in delta (default) - assumed loaded kV = 114.4 RPM per volt. These will be run on 10S with a 7.27:1 reduction for 470 RPM @ 3v LVC - or 28mph.

I may need to increase the reduction a bit but that should be good enough.

Well... seeing that the Capreo is out (too expensive and propriatary) what else would everyone suggest?

As of now I figure I will be building some wheels from scratch and probably will just buy a few SA3 rears to use with Gary's adapters to wedge a right side drive sprocket in place.. the chainstays are very spacious.

-Mike

 

[evblazer]

The http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1181663187
has a rear disc.. Course it is 230 and lightwieght and actually probably 135.

130mm with a disc though? That is going to be rare but some hubs might be able to be adjusted down but I don't know which.
If you could have fit 135 I would have suggested just a plain old mtb hub with a nice tough rhyno rim like so.

I went to universalcycles.com and used the custom wheelbuilder
Spokes Wheelsmith Stainless Spokes
- 2.0mm Silver View Change Remove
Nipples Brass Nipples (Complete Wheelsets Only)
- Silver 12mm View Change Remove
Rear Hubs Shimano FH-M525 Deore Rear Hub
- Black 36 - 135mm Spacing View Change Remove
Rear Rims Sun Rhyno Lite Rim
- 20" x 36h (Black w/Silver sidewalls) View Change Remove
$87.62

Course with a 130mm or less I don't know where to find a cheap hub. I probably have 10 406 wheelsets at home and none of them would work for you

 

[geekybiker]

Yes the Dahon Jetstream has the right type of wheel but... if I wanted a dahon I would just buy one = )_

I was more getting at that you could either contact a dealer and ask for a rear wheel as parts, or dig up the specs on their hub and build your own wheel. Same thing with any other folder brands. Most of them have similar rear hub spacing. Just find a model that has what you like and see if you can order parts.

 

[mwkeefer]

The http://www.hostelshoppe.com/cgi-bin/readitem.pl?Accessory=1181663187
has a rear disc.. Course it is 230 and lightwieght and actually probably 135.

130mm with a disc though? That is going to be rare but some hubs might be able to be adjusted down but I don't know which.
If you could have fit 135 I would have suggested just a plain old mtb hub with a nice tough rhyno rim like so.

I went to universalcycles.com and used the custom wheelbuilder
Spokes Wheelsmith Stainless Spokes
- 2.0mm Silver View Change Remove
Nipples Brass Nipples (Complete Wheelsets Only)
- Silver 12mm View Change Remove
Rear Hubs Shimano FH-M525 Deore Rear Hub
- Black 36 - 135mm Spacing View Change Remove
Rear Rims Sun Rhyno Lite Rim
- 20" x 36h (Black w/Silver sidewalls) View Change Remove
$87.62

Course with a 130mm or less I don't know where to find a cheap hub. I probably have 10 406 wheelsets at home and none of them would work for you

Brother,

That's fat, so I could (if I have 135mm clearance) just build using a mtn bike hub? Thanks for verifying, as noted one of the models does infact have a 135mm rear dropout clearance and is designed for a 9sp cassette - if I could build a wheel to fit that space with a 9sp cassette and iso mounts (for left side drive) then I would be on cloud nine on that bike and would remove a bunch of heft my current hub motor drives (only 10lbs but still) add to the unsprung weight.

In comparison - an astro drive (3210) using #25 chain and an 80t rear sprocket adds a total of 3.4lbs unsprung (has to be rear swing arm mounted) and I could go with a Tower Pro 5330 reterminated to wye (I have 4 of these left from old HK orders) to drop the added weight to below 3lbs which imho is perfect... that puts me at about 30lbs with fenders and battery box (no batteries) mounted below main tube + drive system... on a 20" folder.

I have one already (the prototype hub) but I am getting a second 9FS and the other bikes cited above, no matter how complicated or difficult I will convert the entire line (it's a challenge) and I will use light weight RC drive systems... I may work on a kempler knock off friction drive some time, how many non hard core riders do you know who bike in the rain? I do but I don't know many others so for a folder, it may be one of those RC based friction drives would work out to be optimal (lord knows to scale it would be tiny for a folder with 1500w of power).

I thank you for your time and thought, I will be ordering the wheel build parts immediatly to do up the first one... Im sure I can find a decent reference online for spoke patterns to use (looking for a more sporty, lighter pattern than stock) and I may be able to get this done before the weekend (which would rock since I have a mount, drive gear, 10' of chain and several different rear 4 bolt (I have an adapter) discs.

I think the tighter folders are going to loose the SA8 in favor of an SA3 with dual drive input using Gary's adapters, since I have one on hand for testing and it is a cost effective solution (also bolt on 100%).

-Mike

 

[mwkeefer]

Yes the Dahon Jetstream has the right type of wheel but... if I wanted a dahon I would just buy one = )_

I was more getting at that you could either contact a dealer and ask for a rear wheel as parts, or dig up the specs on their hub and build your own wheel. Same thing with any other folder brands. Most of them have similar rear hub spacing. Just find a model that has what you like and see if you can order parts.

I tried that with local dealers, they will not sell me parts unless I can provide them my Dahon serial number = (_

I like the Jetstream but I prefer to stick with std parts as much as possible so I can upgrade / replace cranks, wheelsets, etc... the Jetstream and dahons in general don't tend to use standard parts anyway.

With regards to other brands they always send me the Capreo way, again propriatary tech = (

Thanks for the help though, it is appreciated!

-Mike

 

[evblazer]

That's fat, so I could (if I have 135mm clearance) just build using a mtn bike hub? Thanks for verifying, as noted one of the models does infact have a 135mm rear dropout clearance and is designed for a 9sp cassette - if I could build a wheel to fit that space with a 9sp cassette and iso mounts (for left side drive) then I would be on cloud nine on that bike and would remove a bunch of heft my current hub motor drives (only 10lbs but still) add to the unsprung weight.

I have 3 quasi-lowracer recumbents, 2 compact long wheel base recumbents and 1 upright folders using 406 wheels that have 135 hubs with and without disc brakes and all use what would be an mtb hubs. Those spokes are going to be hard to put in and stuff like a park tool spoke gauge won't fit because the spokes are so short. For $86 bucks it might be worth getting someone else to suffer unless you can get some good part scores or have spare parts.
If you find any sturmey archer 8 speed internals with disc brakes let me know everywhere is out of stock and I want 2 for a back to back quasi lowracer tandem recumbent with independent drivetrains 8)

 

[coln72]

I have a 406 with a 10 speed cassette and disc brake mount which a bought from http://greenspeed.com.au. We use their wheels on our race trikes without problems. They have dealers in the US so maybe contact them.

 

[mwkeefer]

Thanks !

emails sent to greenspeed and also to Peter White Cycles - thinking a nice Velocity rim for my personal ride -= )_

-Mike

 

[mwkeefer]

evb,

I've been searching for the SA8(w) with the disc which I think is the XRF8(w) (though there are so many different models I havent a clue)... I am getting kinda lucky in that the initial SA8 was weak and shifted poorly (we all know that, a quick google reveals it... on all bikes) so the folder company had returns and will sell those returned along with a new SA8(w) model for rebuilding the rear wheel at a considerable discount.

So I will have about 5 SA8(w) sadly no disc mounts... and these are narrow, I want to say 120mm but I could be wrong.

If I happen upon them (I have emails and calls all around) I will notify you... I've been looking for bikes which include them stock too... if there is such a beast yet, none that I've found yet... they are just not out yet.

Excellent on the 406 on a mtn bike hub... that works!

-Mike