Author Topic: Need Help - Difficulty with Tire Tube Size (Read 2344 times)

bharvey60 · « **on:** March 09, 2012, 03:06:20 pm »

I have a 750K3 and have a 110/90-18 rear tire to mount. I bought a 110/100 tube with TR-4 valve, but the mechanic tells me I need a tube with a TR-15 offset 16mm valve. I haven't been able to locate a tube in this size. Does anyone know where I can locate this tube or if another tube works. The local Honda dealer could not source one and I haven't had much luck looking online. Thanks.

Hinomaru · « **Reply #1 on:** March 09, 2012, 03:46:08 pm »

The original Honda 750K tube for the 4.00 X 18 rear tire is part number: 42712-300-000 which is no longer available.

Honda has superseded this old tube to a new part number: 42712-KT1-671 and shows available with a retail cost of around $10.00

Perhaps your Honda dealer didn’t know this?

bharvey60 · « **Reply #2 on:** March 09, 2012, 04:07:44 pm »

From the part description and picture, the OEM part 42712-KT1-671 looks like a TR-4 8mm valve. The rim on my K3 definitely takes a TR-15 stem, which is 16mm in diameter, as compared to the TR-4 8mm tube on the front wheel. Was the TR-15 the standard valve for the rear, or do I have an aftermarket rim? Previous owner is deceased, so no help there.

Hinomaru · « **Reply #3 on:** March 09, 2012, 04:20:52 pm »

Sounds like you have an aftermarket rim, the part numbers I posted were for a factory stock / OEM 750K rim, which is what I thought you had. Can you post up a picture or two of your rim so the other members can see what you are working with? I can’t even make a good guess ...

bharvey60 · « **Reply #4 on:** March 10, 2012, 04:24:44 am »

Here are photos of the rim.

bryanj · « **Reply #5 on:** March 10, 2012, 04:35:29 am »

Those spokes look very short to me, are you sure it's not a 16 inch rim?

bharvey60 · « **Reply #6 on:** March 10, 2012, 04:50:05 am »

I just measured and you are correct. It is a 16.

I had assumed it was stock, but we all know what happens when we assume. I'll be ordering original size spokes and rim. Anyone know of a good source for stock rims/spokes? I've found an OEM Rim $153 through Bikebandit

ekpent · « **Reply #7 on:** March 10, 2012, 05:06:31 am »

What you have now was the popular "Harley" 16" rear wheel conversion. Rim looks to be in pretty good shape,bet there would be some interest in it from the chopper builder crowd

bharvey60 · « **Reply #8 on:** March 10, 2012, 05:34:10 am »

After reading up on this a bit, I'm considering keeping it as is. 1/2 shorter is good for me, more rubber on the ground and better look. Wonder how this handles differently from stock?

ekpent · « **Reply #9 on:** March 10, 2012, 05:53:53 am »

I have one on one of my bikes,it handles OK but maybe gives a slightly harsher ride,but I am not a canyon carver either.Usually when you consider the height and size of the tire the ratio's work out pretty close to an 18 as far as gearing etc.

bharvey60 · « **Reply #10 on:** March 10, 2012, 06:18:23 am »

I ordered a 130/90 tire and a TR-15 Offset 5.00/5.10 Tube. This matched with the MT90-16 tire that was on the bike and seemed to be the right tube size. Is this correct?

Harsh · « **Reply #11 on:** March 10, 2012, 07:01:24 am »

Whatever it is, it looks to be laced incorrectly. Looking at the first two pics it appears that at least two of the spokes are bent.

ekpent · « **Reply #12 on:** March 10, 2012, 07:49:42 am »

Those outside do look bent. Here is some wheel lacing stuff. Starts around pg 13. http://www.hondachopper.com/gallery_misc/chopper_bible/index.html

LesterPiglet · « **Reply #13 on:** March 10, 2012, 04:19:04 pm »

In the third picture you can see marks on the hub from the previous spokes....and a few dents in the rim.

MCRider · « **Reply #14 on:** March 10, 2012, 06:17:24 pm »

Quote from: LesterPiglet on March 10, 2012, 04:19:04 pm

In the third picture you can see marks on the hub from the previous spokes....and a few dents in the rim.

Good eye. But in my experience, and hence my opinion, it is laced correctly for what it is. What appears to be bends are just that, but i suspect every outside spoke looks like that. Necessary to get it to curve back to the near centerline of the rim. because the center of the rim is so much closer to the hub than a stock rim would be, the outside spokes must carry a bigger bend. Many of the 16 inch spoke kits don't even try to make the outside bend and are laced all on the inside of the hub. Many threads and discussions on this.

The reason the spoke and the old scar on the hub don't line up is a similar problem. Again because the center of the rim is closer t the hub, the spokes are much shorter than stock and can't make the original cross 2 pattern. Instead they are laced cross one, pointing to the rim in a more severe angle than the stockers. Hence the old scar is exposed.

The bulk of the wheel is "unsprung weight". The carcass of that 16' car tire weighs much more than the original 18 or later 17" tires. This unsprungweight acts to overwhelm the shocks and degrades the ride.

IMO.

bharvey60 · « **Reply #15 on:** March 10, 2012, 06:37:06 pm »

After comparing the lacing photos in the chopper bible to my wheel, it does appear to be laced correctly and MCRider is correct in that each spoke has a certain amount of bend in it. Given the added expense of returning the wheel to stock, I'm going to keep it as-is for now.

FYI, I found a source in CA that provides replacement spoke kits specifically for the Honda/16 Harley conversion.

http://www.buchananspokes.net/products/spoke_kits_honda_cb.asp

Thanks all for your help with this. I appreciate it.

MCRider · « **Reply #16 on:** March 10, 2012, 07:02:31 pm »

Quote from: bharvey60 on March 10, 2012, 06:37:06 pm

After comparing the lacing photos in the chopper bible to my wheel, it does appear to be laced correctly and MCRider is correct in that each spoke has a certain amount of bend in it. Given the added expense of returning the wheel to stock, I'm going to keep it as-is for now.

FYI, I found a source in CA that provides replacement spoke kits specifically for the Honda/16 Harley conversion.

http://www.buchananspokes.net/products/spoke_kits_honda_cb.asp

Thanks all for your help with this. I appreciate it.

Buchanans is often referred to here for spokes and rims. many of us have bought from them. Often their spokes are more expensive than those that can be found elsewhere, especially for the 16" conversion. But Bucky's is well known for expertise and quality.

You'll find the occasional disgruntled customer, but by and large Bucky's is the place fopr spokes and rims.

LesterPiglet · « **Reply #17 on:** March 10, 2012, 07:32:43 pm »

was doing a bit of searching and came across these... http://www.linkint.com.au/rad_annodised_nipples_page.html purty.

ekpent · « **Reply #18 on:** March 11, 2012, 07:19:07 am »

Checked mine at the shop yesterday and it had the conventional lacing with outer and inner spokes.No bends and the spokes are quite thick, probably a different kit. See this e-bay wheel has them all on the inside as MC mentioned.

MCRider · « **Reply #19 on:** March 11, 2012, 08:49:48 am »

Quote from: ekpent on March 11, 2012, 07:19:07 am

Checked mine at the shop yesterday and it had the conventional lacing with outer and inner spokes.No bends and the spokes are quite thick, probably a different kit. See this e-bay wheel has them all on the inside as MC mentioned.

YEah all kinds of spoke kits and rims differ (slightly) in the placement of holes. Mix and match results are varied.

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Author Topic: Need Help - Difficulty with Tire Tube Size (Read 2344 times)

Hinomaru

Hinomaru