Tyres

Here you can talk about all kind of TECH for the B50 B44 B25 And Other BSA unit Singles

Moderator: minetymenace

Post Reply
JerryT
>60
>60
Posts: 67
Joined: Wed Oct 30, 2019 8:51 pm
Location: BARNSLEY

Tyres

Post by JerryT »

It's been a long time since I bought a motorcycle tyre.
I will be needing two new tyres for my B25 SS re-build. I have purchased two Valtru 18 inch WM2 rims and will be building these up this coming week.
The old tyres were 3.25 on the front and 3.5 on the rear.
The bike will be NOT be used off road so could anyone recommend a good tyre brand/type/combination/supplier???
TIA
Jerry
User avatar
JB
>480
>480
Posts: 499
Joined: Tue Jun 15, 2004 8:32 am
Location: Devon, England

Re: Tyres

Post by JB »

Although currently the only unit single I've got that's roadworthy is a B25T model with trail tyres, if and when I get my B50SS Road bike project up and running I would definitely fit Dunlop K70's front and rear, it's similar to what was fitted to these bikes when new and they look spot on, especially compared to more modern low profile tyres.

Have a look at Rookster's Hammer of The Gods bike to see how K70 tyres just look right.

Cheers, John
Last edited by minetymenace on Tue May 19, 2020 11:15 am, edited 1 time in total.
Reason: Link added
BasilF
>100
>100
Posts: 112
Joined: Sun Dec 18, 2011 10:35 am
Location: Countesthorpe, just south of Leicester.

Re: Tyres

Post by BasilF »

I've put Dunlop K81/TT100 on mine as they were what I fitted in 1975 and they are still available.
Canberra
>1200
>1200
Posts: 1294
Joined: Fri Sep 03, 2004 11:45 am
Location: Canberra, Australia
Contact:

Re: Tyres

Post by Canberra »

I find it'll come down to what you want yourself. Original type patterns, albeit with better compound material, or go for a more modern sportier tyre. I have fitted Metzlers on mine at moment and they seem OK although I do normally prefer Avons. It came down to price as I find the B50 is rather hungry on tyres when you do a few longer loaded trips on the road. They are lower profile tyres than Dunlops and it'll come down to what fits the original rims although my rims are also not standard B50SS. Also how they look on the bike.
John
User avatar
JB
>480
>480
Posts: 499
Joined: Tue Jun 15, 2004 8:32 am
Location: Devon, England

Re: Tyres

Post by JB »

The K70 is a very good tyre and especially so for a 250, don't forget they were the std fitment on A65's, T120's and T140's until the later ones changes to K81's.
JerryT
>60
>60
Posts: 67
Joined: Wed Oct 30, 2019 8:51 pm
Location: BARNSLEY

Re: Tyres

Post by JerryT »

Thanks for all the replies.
The rear wheel actually came with a Dunlop K70 fitted. The tyre seems to be barely worn and although it has stood for many years I don't see any evidence of perishing. Seems to make sense to re-fit it onto the new rim.
Jerry
User avatar
2manyrides
>580
>580
Posts: 596
Joined: Tue Aug 08, 2006 1:29 am
Location: Citrus Heights California

Re: Tyres

Post by 2manyrides »

I vote for K81’s.
In the 45+ years riding my ss, they’ve always been my favorite. And I have burned through many a tire.
I have never worried about what fits the rear. Fatter the better.

But I put up for discussion the tire soze availabe for the front regarding K81’s...
I ran the 3.60 when they were in production long ago. Now that we are in the “new age”, It’s my observation the smallest you can get for an 18” wheel is 4.10...
And with that, you rub the fender stay wire on a stock fender.

I had saved a reproduction cheng shin 3.50 front for the longest time and finally geared up with K81’s again via that and a dunlop 4.25 K81.
My view is the K70’s are a good tire for all round use but to me, their profile is too squared off for the wonderful cornering capabilities the b50 has.
345ADAB9-86A4-4E05-8BE9-61C895099DFC.jpeg
72 B50SS bought in 74, I'm the second owner
74 TR5MX bought in 77-new, I'm the original owner

Which one to ride today?
User avatar
Didlydon
>60
>60
Posts: 60
Joined: Tue Nov 15, 2016 12:27 pm
Location: Broadstairs, Kent

Re: Tyres

Post by Didlydon »

I fitted Michelin Siracs to my rebuilt B44 VS (with B50 front end) after reading good reviews on tinternet. 90/90 x 21 front, 4.10 x 18 rear. Handling is great & they don't look too bad as well. Recomended... <200
User avatar
Didlydon
>60
>60
Posts: 60
Joined: Tue Nov 15, 2016 12:27 pm
Location: Broadstairs, Kent

Re: Tyres

Post by Didlydon »

Here you go a couple of pics hopefully.....
Attachments
IMG_20190525_162058.jpg
IMG_20190525_161932.jpg
User avatar
malcward
>400
>400
Posts: 419
Joined: Thu Jan 12, 2012 7:07 pm

Re: Tyres

Post by malcward »

Hi Jerry
I have fitted Dunlop K82s to my B50
In 3.35 and 3.50 sizes
Cheers Malc
User avatar
JB
>480
>480
Posts: 499
Joined: Tue Jun 15, 2004 8:32 am
Location: Devon, England

Re: Tyres

Post by JB »

Those K82's look an interesting option Malcolm, they appear to be a mixture of the K70 & a K81 and a good range of widths for 18-inch wheel size. :thumb
Post Reply