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Old 04-26-09, 02:43 PM   #1
rossmcloch
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New R20 + Upgrade discussion

I recently purchased an R20 and wanted to post some pictures and discuss some upgrades.

Things I am definitely upgrading:
-Alloy wheels (not sure yet on 406 or 451)
-BB, un72 + phil wood. I dont think I want to mess with re-tapping just yet
-Seat + Seat Post

Things I might upgrade:
-Handle bars
-Brake Calipers
-Rear Hub
-Fork

I realize replacing the wheels give you a nice reduction in weight but I'm curious where people find other ways to shave weight? Is it just a small decrease with each part upgrade or are there some big parts that are really heavy?





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Old 04-26-09, 03:10 PM   #2
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Some R20 owners use the original SA 3 spd hub with new rims, others use either a SA 8 spd or a Shimano Nexus 8 spd IGH, those 8 spd hubs are not light, so there's not much weight loss there. If you're prepared to tinker then, some guys have converted to a 6 or 7 spd cassette hub and RD set up and shaved weight off that way.....(you might find that the smallest gear on a 7 spd will be too close to the frame and will rub)

The best weight loss for the drive train would be going to a single speed or fixed gear, a very pure form of cycling...hope you don't live/ride in hilly areas.

Using lighter materials for the seat post, head stem, brakes etc etc will shave some weight as well.

If you have a UN72 BB then make sure it's 73mm wide and the spindle is approx 113 or as close as possible, any longer and you will have trouble achieving a straight chain line. If you don't have one yet....good luck finding it, they getting hard to find!!
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Old 04-26-09, 03:36 PM   #3
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Some R20 owners use the original SA 3 spd hub with new rims, others use either a SA 8 spd or a Shimano Nexus 8 spd IGH, those 8 spd hubs are not light, so there's not much weight loss there. If you're prepared to tinker then, some guys have converted to a 6 or 7 spd cassette hub and RD set up and shaved weight off that way.....(you might find that the smallest gear on a 7 spd will be too close to the frame and will rub)

The best weight loss for the drive train would be going to a single speed or fixed gear, a very pure form of cycling...hope you don't live/ride in hilly areas.

Using lighter materials for the seat post, head stem, brakes etc etc will shave some weight as well.

If you have a UN72 BB then make sure it's 73mm wide and the spindle is approx 113 or as close as possible, any longer and you will have trouble achieving a straight chain line. If you don't have one yet....good luck finding it, they getting hard to find!!
I think Im probably going to stick with the original 3 speed and build new wheels. How heavy is the original SA hub?

I live in a fairly hilly area so a single speed is not a good option (I have a single speed road bike and its a tough ride - not ideal for commuting).

I found a 73 x 115 un72 bb. I think I'm probably not going to find any closer to 113. Should that work ok?
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Old 04-26-09, 04:50 PM   #4
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you can also lose a fair bit of weight by getting alloy handlebars as well as the seatpost. After that - big losses aren't so forthcoming; unless you are a whizz who can rustle up some carbon forks for it!

Seriously though - a 20 is never going to be a little lightweight, but replacing steel things with alloy or titanium will yeild some results (and stave off any rust). The most important thing really is get it in good enough shape to go out and enjoy it!
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Old 04-26-09, 05:01 PM   #5
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I upgraded to strong rims and high pressure tires on my R-20. I live with hills so I switched to a 15T rear sprocket. I put the old style one piece handlebars on and find them more comfortable and more stylish than the original bars. I'm in the process of feeding high end expensive parts to a sears tote-cycle and have to wait to upgrade the raleigh BB.
This is the before pic of the tote/cycle... stay tuned!
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Old 04-26-09, 09:24 PM   #6
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Originally Posted by rossmcloch View Post
I think Im probably going to stick with the original 3 speed and build new wheels. How heavy is the original SA hub?

I live in a fairly hilly area so a single speed is not a good option (I have a single speed road bike and its a tough ride - not ideal for commuting).

I found a 73 x 115 un72 bb. I think I'm probably not going to find any closer to 113. Should that work ok?
I will weigh one and get back to you on that, stay tuned. Probably not as heavy as my SA 8spd!!!

115mm should be good.
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Old 04-27-09, 04:29 AM   #7
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I like the lightweight tyre option on the tote!
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Old 04-27-09, 07:51 AM   #8
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I like the lightweight tyre option on the tote!
Yes, very low profile!!
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Old 04-27-09, 08:44 AM   #9
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I think Im probably going to stick with the original 3 speed and build new wheels. How heavy is the original SA hub?
I've had this picture kicking around for ages:



Chuffin' heavy!

I kept the hub even though it was heavy.
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Old 04-27-09, 09:47 AM   #10
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you can get alloy shelled SA hubs
internal gear hubs arent super lightweight.
Theres an Sturmey Archer website that shows pictures and specs of modern and old model hubs.
Is that a 28 spoke hub in the pic?
surely a 36 or 40 hole hub would be a few grams lighter
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Old 04-27-09, 10:10 AM   #11
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I got my R20 non folding down to around 12kg[27lbs] I think originally it was around 17kg

i could bring it down some more to maybe around 10~11kg[24lbs] but its insignificant

the wheels is where you want to loose weight. Doing that alone is the best ugrade you'll ever do the rest is just for cosmetics.

I have both the 406[on my folding version] and 451 wheels and i would say i like the 451 wheels as it feels more like a full size bike ride but downside is availability/choice of tyres

heres the list of what i replaced that was made of steel and now alloy part

levers
brake calipers
crank
seatpost
removed the steel fenders

if i remove/replace the steel kickstand/steel handlebar/stem the weight would drop some more

but i gained some on the rear rack !

http://i305.photobucket.com/albums/n...922b4dc1_o.jpg
http://farm4.static.flickr.com/3554/...922b4dc1_o.jpg

Last edited by EM42; 04-27-09 at 10:15 AM.
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