Go Back  Bike Forums > Bike Forums > Folding Bikes
Reload this Page >

Chain guard for Dahon Speed Uno

Notices
Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

Chain guard for Dahon Speed Uno

Old 09-06-16, 08:39 AM
  #1  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
Chain guard for Dahon Speed Uno

Hi,

I'm looking for a simple chain guard ring (bash guard) to stop my trousers touching the chain on my Dahon Speed Uno. It came with a big ugly full guard which I've removed. I don't fancy the biologic freedrive a lot of these seem to have on.

Having just read about BCD measurements etc I think the chain ring is a fairly unusual 94mm between the 5 bolts?

If anyone can suggest a chain guard that will fit that would be great!



Cheers,
Carl.
tpk is offline  
Old 09-06-16, 12:19 PM
  #2  
Senior Member
 
smallwheeler's Avatar
 
Join Date: Aug 2012
Location: NYC
Posts: 2,380
Likes: 0
Liked 11 Times in 9 Posts
Originally Posted by tpk
Hi,

I'm looking for a simple chain guard ring (bash guard)...
this is probably the part you're looking for. although, i seriously doubt you'll find it being sold separately. you might consider upgrading from that swaged crank to a new crankset. or possibly make your own chainguard...

smallwheeler is offline  
Old 09-06-16, 02:37 PM
  #3  
Heck on Wheels
 
SloButWide's Avatar
 
Join Date: Sep 2015
Location: USA Midwest
Posts: 1,055

Bikes: In Signature

Likes: 0
Liked 3 Times in 3 Posts
Something like this?
__________________
"I had a great ride this morning, except for that part about winding up at work."

Bikes so far: 2011 Felt Z85, 80's Raleigh Sovereign (USA), 91 Bianchi Peregrine, 91 Austro-Daimler Pathfinder, 90's Trek 730 Multitrack, STOLEN: 80 Schwinn Voyageur (Japan)

SloButWide is offline  
Old 09-06-16, 03:31 PM
  #4  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
smallwheeler, yeah I guess that's what the bike is supplied with when it comes with a biologic freedrive plastic wrap. i thought that's what I was getting but instead it was this



SloButWide, cheers. that TRUVATIIV bash guard is the sort of thing I want but 5 bolt for 48t teeth.

driveline do good ones but it seems my problem is the less common 94mm bolt distance.

Last edited by tpk; 09-06-16 at 03:36 PM.
tpk is offline  
Old 09-06-16, 06:51 PM
  #5  
Banned
 
Join Date: Sep 2016
Posts: 69
Likes: 0
Liked 2 Times in 2 Posts
1) read this to measure the bcd: Sheldon Brown's Bicycle Crank/Chainring Bolt Circle Diameter Crib Sheet

2) search for xxx chain guard on ebay, where xxx is the bcd

for example: 110 chain guard | eBay

3) buy chain guard and wait about a month or more to ship to your address

(dont forget the chain ring bolts if the auction doesn't come with some)



or you can make one out of a plastic frisbee and some spacer washers and 5 chain ring bolts.

Last edited by ckarr; 09-06-16 at 06:58 PM.
ckarr is offline  
Old 09-07-16, 03:00 AM
  #6  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
Thanks ckarr, I think I might look at just making one myself.

Unless I'm missing something that Sheldon link and others I've seen don't even include the measurements for mine as it's around 94mm distance between holes.
tpk is offline  
Old 09-07-16, 07:46 AM
  #7  
Banned
 
Join Date: Sep 2016
Posts: 69
Likes: 0
Liked 2 Times in 2 Posts
those holes in the crankset are not in right place, they are there for a custom chain guard, and they dont even look like they will fit regular size chain ring bolts.

if you have a drill press you can measure carefully and drill out 5x holes for a 110 BCD chainring (110 is the compact crank size standard, alternatively you can also try 130 BCD which is the old standard). then you can now fit any standard 110 or 130 bcd chain guard.

or you can do the above AND you can even take a hacksaw and hack off the ends of the chainring on your bike and then you can now even replace the chainring with any size you want (by looking at the pic, is the uno crank a 1 peice crankset? cause it looks like it).

or you can buy a 110 or 130 bcd crankset. you might need to get a larger 52t or 53t chainring or whatever the uno has since it does look pretty big.
ckarr is offline  
Old 09-07-16, 08:35 AM
  #8  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
Thanks again. At least I know now it's just not a common size hence my struggle to find something off the shelf.

I was tempted to buy a frisbee but as you say the holes may not even be regular chain ring bolt size so it'll need more thought.

I think it is a one piece set. Don't quote me on that though.

I might just do without until I feel like upgrading the crankset completely as you suggested.

Last edited by tpk; 09-07-16 at 08:39 AM.
tpk is offline  
Old 09-07-16, 08:38 AM
  #9  
Banned
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Liked 1,361 Times in 867 Posts
@ LBS they throw away plastic chainguards that come with new BMX bikes,

maybe you can adapt one to work on your folding bike.
fietsbob is offline  
Old 09-07-16, 08:44 AM
  #10  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
Cheers fietsbob. Frustrating that the bike was pictured with the sort of chain guard i want (and biologic freedrive) but came with something so big an ugly it had to go, then a replacement is not immediately available due to custom spec.

I'll look at the cost of replacing the whole crankset long term, maybe knock something up for now.
tpk is offline  
Old 09-07-16, 08:48 AM
  #11  
Banned
 
Join Date: Sep 2016
Posts: 69
Likes: 0
Liked 2 Times in 2 Posts
even though the bolt holes for the chain guard are not the right standard size you can still do it with a frisbee (or any plastic plate). just get the frisbee, a knife to cut out the center, and 5x screws/washers/nuts at the hardware store and you will be set.

Last edited by ckarr; 09-07-16 at 08:59 AM.
ckarr is offline  
Old 09-07-16, 08:58 AM
  #12  
Senior Member
 
badmother's Avatar
 
Join Date: Nov 2007
Posts: 3,720
Likes: 0
Liked 1 Time in 1 Post
Since you want to stop your trousers from touching the chain, why not buy that plastic tube thingy (can not remember the name) that is cowering the chain in the picture that smallwheeler posted?
badmother is offline  
Old 09-07-16, 08:59 AM
  #13  
Banned
 
Join Date: Sep 2016
Posts: 69
Likes: 0
Liked 2 Times in 2 Posts
i took another look at that chainguard that your bike came with, it looks bad but it is not that bad. these full guards are actually better than the ones you wanted since there is no way your pant leg will rub up chain grease (unlike the ones that only cover the chainring). if you really dont like it, just spray paint it black and it will match the bike and look alright.
ckarr is offline  
Old 09-07-16, 09:06 AM
  #14  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
badmother, ive read a few not so good reviews about them. i'd rather leave most of the chain exposed and just lessen the chance of oil on clothes if poss. also when the bike has been supplied with the free drive plastic it also has the sort of simple guard I'm after, so maybe it needs the guard to hold the plastic in place? not sure.

ckarr: i took it off in disgust when i first got the bike. feels like over kill but if the weather turns bad here and i haven't found anything else, i'll stick it back on. thanks for all your suggestions. the main thing was realising the whole BCD thing and that this bikes crankset is not normal. its true the guard it came with would absolutely do the job..
tpk is offline  
Old 09-07-16, 09:12 AM
  #15  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
I just think it stands out on an otherwise simple clean design bike. The only bit of chain guarding I want is where my leg goes near it.

Last edited by tpk; 09-07-16 at 09:17 AM.
tpk is offline  
Old 09-07-16, 09:24 AM
  #16  
Senior Member
 
smallwheeler's Avatar
 
Join Date: Aug 2012
Location: NYC
Posts: 2,380
Likes: 0
Liked 11 Times in 9 Posts
Originally Posted by tpk
I just think it stands out on an otherwise simple clean design bike. The only bit of chain guarding I want is where my leg goes near it.
smallwheeler is offline  
Old 09-07-16, 09:31 AM
  #17  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
I do a bit of woodworking so maybe I can fashion one of these from ply and paint it black ;-)

tpk is offline  
Old 09-07-16, 09:47 AM
  #18  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
I can get a fairly cheap chain ring guard with the right diameter like this:



or this:



which I can probably adapt.

Maybe I'll end up wanting a different crankset anyway once I've had the bike a while, at which point I can get one which standard BCD. Thanks.
tpk is offline  
Old 09-07-16, 10:59 AM
  #19  
Banned
 
Join Date: Sep 2016
Posts: 69
Likes: 0
Liked 2 Times in 2 Posts
if you do get a new crankset, make sure you calculate the gear inches properly. i would guess by whats written on the internet yours is 52/16*20 = 65 gear inches.

the big chain ring on these small wheeled bikes is important because of the small wheels, make sure you get a 52t or even higher if you want to keep up your speed.

here is a calculator: Sheldon Brown's Bicycle Gear Calculator

Last edited by ckarr; 09-07-16 at 11:06 AM.
ckarr is offline  
Old 09-07-16, 11:49 AM
  #20  
tpk
Junior Member
Thread Starter
 
Join Date: Sep 2016
Posts: 10
Likes: 0
Liked 0 Times in 0 Posts
Thanks, I'll make sure I grasp that before/if getting an upgrade on the crankset. I think theyve got the gear perfect for being fast enough on flat and not too hard on the odd hill so I wouldn't want to mess that up.
tpk is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AZHiker
Folding Bikes
1
04-28-19 11:00 PM
alexvazquez
Folding Bikes
4
05-01-17 10:50 PM
Steely Dan
Folding Bikes
14
05-08-12 05:56 AM
pnp
Folding Bikes
10
02-24-12 01:48 PM
CAX
Folding Bikes
19
05-13-10 09:02 AM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.