19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)

[Rix]

thanks Rick

i thought it was odd too. very unexpected. iv ordered spokes from them too and been very impressed( even if a little slow to ship)

thanks for advice, ill just keep trying to contact them.

oh, and it was Nov '13 not '12.my bad

There website shows out of stock for the Magura throttle, I wonder if they just billed you and placed it on back order status?

 

[ridethelightning]

hmmm. could be. but why no reply to maybe 5-6 emails over several months???

i also recall mailing voltriders as a last resort.no joy either.

i did manage to get throuh to jrh shop on skype last night, but ofcourse it was outside their opening hours, so i just left a message.

id have to ring at 4 in the morning or something to catch them.

 

[sigimem]

I joust found this useful calculator in a german motorcycle forum. You can calculate the cirumfance of you tyre with it.
good for comparing different rym and tyre sizes.

First input ist Width, second is height in % and third diameter

http://www.cbr900.de/allgemeines/technik/umfang.php

you can also guess Bicycle circumfence by putting height to zero ( so the calculator forgets the tyre and only the rim is shown)

 

[Mr Lowbank]

I have been trying to hunt down some Shinko SR241 2.75x1 tires in Australia No luck with GCMotorcycles. but Just spoke to Bruce Collins Enterprises they are a importer for Shinko. they don't stock them but are going to find out about minimum order. any body have another source or interested in getting some in Australia.

What about these tires? has any body used them?
250-19 (250x19) MITAS ROAD TYRE: H02 UNIVERSAL http://www.classictyres.com/item/617/250-19--250x19--mitas-road-tyre--h02-universal
225-19 (225x19) CONTINENTAL ROAD TYRE: KKS http://www.classictyres.com/item/329/225-19--225x19--continental-road-tyre--kks-universal
250-19 (250x19) CHENG SHIN TRIALS TYRE: C186 http://www.classictyres.com/item/305/250-19--250x19--cheng-shin-trials-tyre--c186-universal

 

[ridethelightning]

try Treatland tv moped superstore(us.) they have them i think and prices are really good.heaps of choice too. email them to get correct shipping cost, which i found very reasonable.

i got a shinko slick sr174 ,2 x hidenau k36 , a huchinsons vroom and 4 tubes- usd$164+117 shipping

i tried AU shops too, choice was crap,prices were ridiculous!

perhaps consider ordering a few extra and selling em off in Aus ?:wink:

 

[Rix]

I have been trying to hunt down some Shinko SR241 2.75x1 tires in Australia No luck with GCMotorcycles. but Just spoke to Bruce Collins Enterprises they are a importer for Shinko. they don't stock them but are going to find out about minimum order. any body have another source or interested in getting some in Australia.

What about these tires? has any body used them?
250-19 (250x19) MITAS ROAD TYRE: H02 UNIVERSAL http://www.classictyres.com/item/617/250-19--250x19--mitas-road-tyre--h02-universal
225-19 (225x19) CONTINENTAL ROAD TYRE: KKS http://www.classictyres.com/item/329/225-19--225x19--continental-road-tyre--kks-universal
250-19 (250x19) CHENG SHIN TRIALS TYRE: C186 http://www.classictyres.com/item/305/250-19--250x19--cheng-shin-trials-tyre--c186-universal

Those 2.50x19 Cheng Shins trials tyre/tire look fairly promising. 1/2" smaller diameter than the 2.75x19 SR241 and about 1/4" narrower, could be the perfect lightweight Ebike tire. I am very surprised in my searches I didn't come across that tire before. Shows what I know. If you get that tire, let us know how you like it.

Rick

 

[arcticfly]

Any one know where I can get 128mm BLACK 10ga spokes?

 

[ridethelightning]

no. but i know where to get a good spraycan though

 

[sacko]

Newsonsportec

There powdercoated black.

 

[Kent]

I have been trying to hunt down some Shinko SR241 2.75x1 tires in Australia No luck with GCMotorcycles. but Just spoke to Bruce Collins Enterprises they are a importer for Shinko. they don't stock them but are going to find out about minimum order. any body have another source or interested in getting some in Australia.

What about these tires? has any body used them?
250-19 (250x19) MITAS ROAD TYRE: H02 UNIVERSAL http://www.classictyres.com/item/617/250-19--250x19--mitas-road-tyre--h02-universal
225-19 (225x19) CONTINENTAL ROAD TYRE: KKS http://www.classictyres.com/item/329/225-19--225x19--continental-road-tyre--kks-universal
250-19 (250x19) CHENG SHIN TRIALS TYRE: C186 http://www.classictyres.com/item/305/250-19--250x19--cheng-shin-trials-tyre--c186-universal

Those 2.50x19 Cheng Shins trials tyre/tire look fairly promising. 1/2" smaller diameter than the 2.75x19 SR241 and about 1/4" narrower, could be the perfect lightweight Ebike tire. I am very surprised in my searches I didn't come across that tire before. Shows what I know. If you get that tire, let us know how you like it.

Rick

I am envious with the selection-especially with road tread as opposed to knobby s.

But keep in mind that European tires are not DOT rated. Anybody who wants to go legal is out of luck.

 

[Rix]

Yah, not a big deal if they are DOT or not out west. I know there are several east coast states that require annual vehicle inspections and if trying to be in compliance, some of these tires could be a problem.

Rick

 

[John in CR]

Rules are meant to be broken, and with nothing but a bunch of lying thieves writing the laws we should feel no guilt in bending and breaking them as we see fit as long as we don't infringe on the rights of others.

 

[johnrobholmes]

hmmm. could be. but why no reply to maybe 5-6 emails over several months???

i also recall mailing voltriders as a last resort.no joy either.

i did manage to get throuh to jrh shop on skype last night, but ofcourse it was outside their opening hours, so i just left a message.

id have to ring at 4 in the morning or something to catch them.

What is your email or order number? There are no emails that were unresponded to in Voltriders (we only get 10 or 20 a week), but there was a period around christmas where we couldn't respond to all the emails at HH. It sounds likely that your spam filter may have caught our responses or your email doesn't allow us to respond, we may miss an email but not 5 or 6.

 

[ridethelightning]

Thanks for the reply JRH

order ID:#12842

ordered on 21/11/2013

indeed i did email around christmas time. definately 5-6 as i recall, there must be something funny going on with email...i thought it was odd, i just couldnt get a peep out of you guys :?

 

[johnrobholmes]

and was the order never received, or was there another issue with it?

 

[ridethelightning]

order was never recieved.

i got the paypal invoice, and a holmes hobbies receipt form stating the details of the order etc. it said the order had been processed but never gave any shipping details or tracking number. was it ever shipped?

i will try sending a copy of the reciept.

 

[pucksterpete]

Question for you guys running smaller rims & larger tires. For the ones that have done the switch down, how much top end speed have you lost or if any?
Thanks
Pete

 

[ridethelightning]

looks like the emails got overlaoded at christams time.
jrh has since contacted me and are arranging a throttle to be shipped as soon as they have stock.


i guesse this sort of thing just happens some times...

 

[Rix]

Question for you guys running smaller rims & larger tires. For the ones that have done the switch down, how much top end speed have you lost or if any?
Thanks
Pete

Ironically, not as much as I thought it would. I have ran my 5403 with a 24MTB Razorback tire (25.5" OD on my tape), which was good for 53-54MPH, no pedaling, then the 19x1.4 rim with a 2.71x19 SR241 (25" on my tape) which was good for 52MPH no pedaling, and I ran a 17x1.4 rim with a 3.00x17 SR241 (23.6" OD if I recall correctly) and it would go 50-51MPH no pedaling. With pedaling add a couple of MPHs on to those numbers. So the speed difference between the biggest and smallest tires I have ran (2" inches or about 50mm OD change) is maximum 4MPH and depending on state of charge for my battery, more like 3mph.

[quotelooks like the emails got overlaoded at christams time.
jrh has since contacted me and are arranging a throttle to be shipped as soon as they have stock.
]

[/quote]

RTL, Took a bit, but glad its sorted out.

Rick

 

[Tench]

I think what happens with the slightly smaller dia wheels is the motors gearing is effectively lowered which lowers top speed but the lower gearing allows the motor to rev a little higher negating some of the difference.

 

[Rix]

I think what happens with the slightly smaller dia wheels is the motors gearing is effectively lowered which lowers top speed but the lower gearing allows the motor to rev a little higher negating some of the difference.

Tench, that's exactly what I think is going on here also. If I was measuring hub shell RPM only, I think my 17x1.4 would be spinning a few RPms faster than the 24MTB being same volts and input. Just like you said, the smaller OD rim/tire combo does effectively lowers the theoretical gear ratio, but with the increase mechanical advantage and decreased load, I think its easier to spin and translates into a few more RPMs. In turn, the difference in top speed is off set and not as much as it should be.

Rick

 

[johnrobholmes]

looks like the emails got overlaoded at christams time.
jrh has since contacted me and are arranging a throttle to be shipped as soon as they have stock.


i guesse this sort of thing just happens some times...

Every now and then something slips by us, and sometimes it slips by more than once. Thanks for being extremely patient and kind about it. We got new throttles in stock and will send one your way (if my worker didn't do it already).



I'm building a set of 19s for my daily commuter now. What really pisses me off (while building wheels) is that none of the available rims are close to having the right nipple hole angles. The run of MMP 17s assemble so beautifully compared to just buying whatever 17 has the right number of holes. Looks like time to get some 19s made I suppose.



I also find that smaller wheels are not as slow as expected. For example, I laced up a regular bafang hub into 16" bicycle rims. General thought would be that speed would be 60% of MTB wheels, or 12mph for 36v vs the regular 20mph. They still get up to about 16mph because of the reduced amp load and voltage drop inside the motor. Makes for a pretty ripping "kids" bike

 

[Rix]

looks like the emails got overlaoded at christams time.
jrh has since contacted me and are arranging a throttle to be shipped as soon as they have stock.

i guesse this sort of thing just happens some times...

Every now and then something slips by us, and sometimes it slips by more than once. Thanks for being extremely patient and kind about it. We got new throttles in stock and will send one your way (if my worker didn't do it already).

I'm building a set of 19s for my daily commuter now. What really pisses me off (while building wheels) is that none of the available rims are close to having the right nipple hole angles. The run of MMP 17s assemble so beautifully compared to just buying whatever 17 has the right number of holes. Looks like time to get some 19s made I suppose.

I also find that smaller wheels are not as slow as expected. For example, I laced up a regular bafang hub into 16" bicycle rims. General thought would be that speed would be 60% of MTB wheels, or 12mph for 36v vs the regular 20mph. They still get up to about 16mph because of the reduced amp load and voltage drop inside the motor. Makes for a pretty ripping "kids" bike

Jr, I talked with Gary at Prowheel Racing and he said if he got bulk orders for rims, 100 he could have the spoke holes punched at angles that would line up and work for ebike hub motors. That's a lot of coin to pull out though. I got three different 54xx hub motors laced up to 17 and 19 x1.4 from Gary as well as an 18x1.85 tegasko. None of the angles are correct. As you are aware, with enough tension, the spokes bend at the nipple and self align though. My next wheel build will be your 18x1.4 gray anodized rim laced to a 4080. I am thinking since the 4080 has a smaller flange diameter than the 54xx, the angles won't be off by as much. We shall see.

Rick

 

[Observator]

Hello. Just went thru the thread. The pictures are very help full when judging size, thank you all for them. I am contemplating going from a 26" crazy bob to a 19" MC wheel. In all honesty I'm not that happy about going to a smaller size, but space constraints are forcing my hand. The wheel is to be used in a swingarm meant for 24" bicycle tries. And i thought if I'm going to the trouble of lacing a wheel, now is the time to do it right.

However after researching this subject some I am in a bind. I don't have allot of funds to splurge on this. And from what i can tell going to a MC setup really ads up in cost. I'm also worried i might end up with a less than expected performance. The motor in questions is a 8t MAC. I have been running at around 1600 wats peak, and don't expect to change that as i need the poor guy to survive. Am i in a to low power spectrum to make MC/Moped tire/rims viable?

I have seen a guy on here running Moto tires on regular BMX wheels, would this be a viable option? I need to limit expense any way i can, but still get a solid setup. With that bit of rambling back story here goes some questions:

Anyone have a good source in EU for any of the following:
19" Rim
Spokes for 19" rim to lace up a MAC motor
Decent tire in 19" preferable not wider that 2.5" inflated.

Any input of thoughts on the above is greatly appreciated.

 

[GCinDC]

before you mentioned the EU, i was going to say that while MC wheels may retail for $200, they can be bought for $35-75, which can be better than DH rims..

glad to hear the pics were helpful. we had some snow on monday and here's another which makes for a funny comparison of my 26x1.75 marathon winter (studded) tire and the 19x2.75 shinko 244: