howdy all. i've got a friend with a dahon folding bike, 20" wheels.
used for local commuting and some light touring.
riding mainly on pavement, with the occasional dirt road.
he weighs around 200+ pounds, with another 25 pounds or so on the rack.
the orginal 20-spoke wheels had too much spoke breakage, so we
upgraded to a 28-spoke rear, but still breaking spokes.
could just be a bad build, or maybe need a stronger wheel.
i've never ridden this sort of bike, so need some advice.
y'all that carry a decent amount of weight....wheel problems?
what would you suggest?
i could buy some new high-quality spokes and rebuild his wheel.
in that case, anyone recommend spoke brand/type and lacing?
or i could just build him a stronger wheel. i was thinking of a novatek
sealed bearing hub (130mm) with 32 spokes. not enough? how about
a shimano dura-ace/ultegra with 36 spokes? thinking of going with an
alex rims DH-19.
Yes- if the rim and hub are in good shape and of good quality, then rebuild the wheel. I'd use DT, wheelsmith, sapin or other quality 2.0/1.8/2.0 stainless butted spokes, and not lace it more crosses than tangential (3 cross on small flanges on a 20" wheel). Use spoke-head washers and tension to 110 KGF on the drive side- make sure to stress-relieve the spokes! But you might be happier with a 32-36 hole Shimano road hub laced to a CR-18, or other eyeletted rim. I like Tiagra for the money; nice strong smooth cup-and-cone hub.
we'll try rebuilding the wheel first. all the wheels i've had built in china have been
total poop. not centered, not stress-relieved, crappy cast-iron spokes. i'm no wheel-
building sensei, but the few mtb wheels i've built have held up to light touring in rough
we'll go with stainless pillar sr14, 2.2/2.0/2.2. 2- or 3-cross, depending on whether
it would overlap the spoke heads. won't know until he brings the bike over tomorrow.
if 28 spokes just won't support his weight, then we can try a 32 rear.
Last edited by saddlesores; 03-24-14 at 01:04 AM.
Reason: the voices tollded me to.
I'm over 200 pounds and ride on 20" wheels quite a bit. I've yet to break a spoke, but I always:
Use 36 spokes when possible
Use a gear hub so that my wheels are not dished
Maybe not an option for you, and maybe overkill. I would build a 32 spoke wheel if I had to, and I would be willing to try a dished wheel, too. But if your friend is already having a problem with spokes breaking, then a sturdier wheel might be in order.
Wheelsmith are my spokes of choice, but there are certainly other options that are well-regarded.
ordered a 20" alex DH19. contacted a few sellers to get the ERD so's i could
calculate spokes. nobody knew what an ERD was. they just sell stuff. emailed
alexrims.......they don't make that model in 20". website only lists 700C and 26".
ok....maybe the usa salesman doesn't know what they sell in foreign markets?
well, my alex rim arrived today. looks nice. but. the label says "ETRTO-559x18"
oops. if the chinese are good at anything, it's copy-n-paste in photoshop.
it would seem somebody somewhere used a chinese production JP brand "power
circle" DP25D, and switched labels.
Hi, saddlesores.I'm from Guangxi China, not far away from Hainan.
I'm using power circle's P19, a single wall 406 rim,for my Dahon HSL.
I built the wheels by myself, using a 20-holes front hub (Novatech A551) and a 28-holes rear hub (by Starhubs). 230800nikiaqpui64ptpi6.jpg
my HSL is mainly used for commuting and light touring. I weigh around 70kg. It seems that 48 spokes work well, till now for about 1 yr.
I think most of the spoke breakage is caused by poor wheel-buliding. e.g. I used to have a 2010 Dahon SP8,with factory-mass-produced 16-spoke front wheel. after 1 year's riding,some spokes losed their tension, and the others got extremely high tension, that cause the wheel swings when rolling in high speed. I guess that if I didn't have repaired the wheel,sooner or later one spoke would have been broken, this never happens on my hand-made wheels.I rebuilt the front wheel and it works well again ,for a relatively long time.
If you want to build strong and reliable wheels , the most important thing is to make sure all of the spokes have been tightened by nearly equal tension.
and before a wheel is ready for road, it must be stress-relieved, and tuning. most factory-mass-produced wheels may not have been stress-relieved and tuned,for productive efficiency and cost-saving. after heavy loaded usage, difference of spoke tension will cause the wheel unstable.(for more info,refer to Sheldon Brown's website.Wheelbuilding)
you can also visit my Taobao online store,首页-阳光海健康生活馆-淘宝网。there're some wheels i had built and sold in my spare time. one of them had been sold to Hainan, bought by a young rider. enjoy it.
+1 on a good quality rebuild. I had my rear wheel rebuilt after breaking one too many spokes. It's doing good after ~300 miles. It's a 28h, cross two, with DT spokes on it. Oh also the poor thing is carrying +250lbs.