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Message started by motoguy on 04/11/19 at 18:46:39

Title: 19" Rear Wheel?
Post by motoguy on 04/11/19 at 18:46:39

I want to build a true Flat Track bike, with 19" front and rear wheels. Is their any problems mounting a 19" rim to the rear hub? I am thinking that the swing arm will have to be modified and go with longer shocks - how long I don't know, is their anything else I should know?

Title: Re: 19" Rear Wheel?
Post by Eegore on 04/11/19 at 21:02:47

You may get it to fit but the belt will be very tight.

I would recommend cutting into the swingarm to increase clearance.

Title: Re: 19" Rear Wheel?
Post by Matchless G11 on 04/12/19 at 04:27:46

I hear the spokes angle (and length ?) are the same as the Xs650, and there are plenty of flat track xs650s.
But as Eegore stated the swingarm will have to be moded. you can get some 18 tires on the back without a modded swingarm. but watch your tire height. Even with a modded swingarm you might not be able to fit a 19. Why ? The choice for a rear 19" are limited and the flat track tires are high, unless you want to run a ft tire.
My personal recommendation is not to run a ft tire on the rear.

But others on this sight are smarter than me, So let the replies chime in.

Title: Re: 19" Rear Wheel?
Post by ohiomoto on 04/12/19 at 06:33:43

I used xs650 spokes with my 18" rim, a stock swingarm, shocks, and belt drive. The trie has to be 26" in diameter max.

You can do a 19" rim. The limitations are tire clearance and belt tension, but you can mod the swingarm and/or do a chain drive. I was thinking of doing a speedway style build with skinny tires. I was going to use a stock front rim and I think I found a few tires that would fit without modding the swingarm.

Title: Re: 19" Rear Wheel?
Post by motoguy on 04/12/19 at 08:46:20

I did check with Buchanan's on using a 19" rim from a LS650 on a LS650 rear hub. They said they have the spokes but they were afraid that the spokes would bow because the 19" rim was designed for a narrower hub.

Title: Re: 19" Rear Wheel?
Post by verslagen1 on 04/12/19 at 09:13:05

You can find existing 18" that may be compatible with the savage pulley and brake hub.
Certain years of the GS450 and 550 are interchangeable.
I would start there.

Title: Re: 19" Rear Wheel?
Post by ohiomoto on 04/13/19 at 05:40:57

20223E283F3A284D0 wrote:

-----------

That could be true, but I think our front hub is actually wider than our rear hub and not by much.

Our skinny rear hub doesn't play well with most pre drilled rims. I had to open up the holes on a cheep rim that was allegedly drilled for an XS. I think it was just a cheap 18" motocross rim.

Title: Re: 19" Rear Wheel?
Post by Ruttly on 04/13/19 at 14:48:53

If your going to go with a 19” rear wheel the swing arm will need to be modded , you should go with a rear disc brake too while your at it. It will look more authentic. I did 18” front & rear and it looks great. Are you using the Ryca kit ?

Title: Re: 19" Rear Wheel?
Post by motoguy on 04/19/19 at 06:41:07

I am trying not to use Ryca parts but would like to fab my parts. I was wondering what is the maximum shock length that I could use with either the belt drive or the chain drive? The reason I asked is that I found some Fox Shocks that are 13.5 inches eye to eye and was wondering if I could use them.

Title: Re: 19" Rear Wheel?
Post by Dave on 04/19/19 at 07:04:32

13.5 inch shock length is the maximum in my opinion....any longer than that and the belt tension will change excessively.

You will have to run the belt tension looser at rest - when you sit on the bike the tension will increase...and even more so when you hit a bump. I adjusted mine by removing the shocks and setting the swing arm height at the 10.5 inch fully compressed length....then adjust the belt snug....and observing how tight it was when I put the shocks back on. I believe it is better to run the belt a bit too loose rather than too tight. (The fully compressed height may be different for the shocks you end up using).

Title: Re: 19" Rear Wheel?
Post by justin_o_guy2 on 04/19/19 at 19:13:46

I believe it is better to run the belt a bit too loose rather than too tight.

Aww HAYULL Yeah

Title: Re: 19" Rear Wheel?
Post by batman on 04/20/19 at 18:48:00

When the swingarm is level ,the belt becomes fully extended unless longer shocks don't allow the swingarm to reach level. I believe the stock shocks do.