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Old 09-30-13, 11:10 AM   #1
jonnyred
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Help with hybrid tyres

Hi there just getting back into cycling after a couple of years off and after having my bikes stolen from my shed. I used to have a lovely hybrid Dawes discovery 601 (2005 model) which was all XT and rode like a dream. I guess it was more MTB with thin wheels really. That had 600 C tyres and I got used to the term. Also had stolen my beloved 1997 Specialized Hardrock MTB which I had restored from nigh on total wreck. This was familiar 26 inch territory. I also had a nice hybrid Carrera Gryphon, which was more flatbar racer and very very fast but a bit uncomfortable for me. The bikes were replaced (kinda) on the insurance although I was forced to choose from a website. I decided to go for a couple of cheaper MTB for the kids and if I fancied a bit a gentle off road 9plenty here in Bristol) and a new hybrid for the wife and me. She opted for a Claude Butler Explorer 400 nice for her commute and again 700c tyres.
I however though I might want a hybrid with a bit more comfort, and after my first 6 choices were unavailable ended up choosing a Ridgeback dual Track X2.2. As I am a total sawn off short ass I ended up trying various frame sizes and they all seemed too big, in the end I had a 15.5 frame which was weird as my MTB is a 17 and perfect. Basically this bike is a MTB with fat road tyres, and if I am honest, I dont like, it rides great, pretty quick, comfortable riding position, but it just doesn't feel right and I couldn't put my finger on what it was.
Recently a mate came round and asked why I had chosen a 29er, I didn't realise I had.

So after that short life story I am asking a couple of things.

1. my tyre size says 28 x 1.75 47-622, is this just a fat 700c tyre or do I have a 29 inch wheel (that's if a 29er is a bike with a 29 inch wheel and not some other designation). I suppose the real question may be is a 700c a 29 inch rim ?
2. can I stick a couple of 26 inch wheels on this bike without to much effort ? Forks should have plenty of clearance, hopefully discs will be alright.

Any direction here would be greatly appreciated, it may stop me selling the blooming thing.
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Old 09-30-13, 11:40 AM   #2
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"700c" rims and "29er" rims (not really a 29 inch rim ) have the same diameter as indicated by the "622" in the ISO number. 29er rims are wider (thicker) than 700c road rims to accomodate wide, MTB tires rather than thin, road tires.

You may want to try a different width tire, but to do so you will want to look at the rim for the proper ISO number (622- ?) rather than the current tire.

I have no experience with disc brakes, so i cannot comment on your 26 inch wheel compatability question.
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Old 09-30-13, 03:13 PM   #3
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If you have disc brakes then I THINK you could switch to 26" wheels but there are two things to consider (that I'm aware of...there may be more)

1) Your pedals will be MUCH closer to the ground and you will have to worry about striking the pedals on the ground when you lean the bike in a turn. This is because 700c wheeled bikes have a lot more bottom bracket drop than 26" wheeled bikes.

2) Changing wheel size may significantly change the handling of your bike in a way that you don't like.
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Old 09-30-13, 03:35 PM   #4
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Thanks for the help guys I may just try the wheels off my MTV and look at clearance, to be honest though I pretty much hate the bike now and will probably try and get rid, looking into possibly building myself a custom that way it should feel exactly how I want or I could just upgrade the GT with better parts. shame really.
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Old 09-30-13, 04:46 PM   #5
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Originally Posted by jonnyred View Post
1. my tyre size says 28 x 1.75 47-622, is this just a fat 700c tyre or do I have a 29 inch wheel (that's if a 29er is a bike with a 29 inch wheel and not some other designation). I suppose the real question may be is a 700c a 29 inch rim ?
29" and 700c are both 622,but real 29er's have wide rims for off-road tires. Many street bikes are labeled 29er's,but they just have wide-ish tires. If your tires are 47mm wide,it could go either way. Look for a sticker on the wheel's rim that says something like "622xNN". NN will be the rim's width. Look it up on this chart:
http://www.schwalbetires.com/tech_in...dimensions#rim

That will tell you what range of tires you can safely run on those rims. The actual maximum width will be determined by how much clearance the frame and fork have.

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Originally Posted by jonnyred View Post
2. can I stick a couple of 26 inch wheels on this bike without to much effort ? Forks should have plenty of clearance, hopefully discs will be alright.
Maybe. My Bad Boy Ultras were actually designed to switch back and forth between 26" and 700c(my F600 is the same bike with different paint and 26" wheels). 700x47 tires are pretty tall,so a 26" wheelset would prolly drop the frame height a good bit. This will make it easier to stand over the bike,but will also increase the risk of pedal strike,and may quicken the handling enough to make the bike unstable. If you have a 26" wheelset,give it a try. Ride around on some quiet side streets and see how it handles and how much clearance you have when the cranks are pointed straight down.
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Old 10-01-13, 06:22 AM   #6
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Thanks i will check the tyres again tonight, and this weekend slap the MTB wheels on and have a look at the clearance. Smaller profile tyres may well make it feel nicer but as i said i dont like the bike now so unless it feels ok on the smaller rims, its pretty much doomed, it cost 600 so i will see what i can get and build myself something i like or upgrade the GT.

i will check back once i try the new wheels just in case anyone else comes up against the same.
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Old 10-01-13, 06:33 AM   #7
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don't forget you are older and haven't been riding since your bikes were stolen. how long ago was that? meaning what you used to like may not be the right choice for now. also, might it be too early to judge? how many hours have you spent on that new bike? I took a long winter break from my bike and after just one ride I thought I had to switch the stem but then I re-thought about my riding posture and adjusted that. now the bike seems fine to me.
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Old 10-01-13, 09:15 AM   #8
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Skinnier tires should make it feel more sporty/nimble.
You could probably go down to 32mm?
That would save a lot of tire weight and improve acceleration.
It'd also reduce the gyroscopic effect and allow quicker turns at speed.

EDIT:
It appears these are your rims?
http://www.alexrims.com/product_deta...pid=72&cat2=21

IF so, you could go down to a 25mm tire.

Last edited by Bill Kapaun; 10-01-13 at 09:24 AM.
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Old 10-01-13, 11:39 AM   #9
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Bikes were stolen this time last year and replaced about march, I guess I have done around 150 miles on the bike. You know how you get to love a bike so it feels like an extension of you, I don't feel it with this bike, its looks, feel, ride, and response and I get none from this one atm. Maybe smaller tyres on this with what is a tiny frame (15.5) will give the feel. This bike would probably make a cracking mtb with its oversize frame and chunky tread tyres fitted.
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Old 10-01-13, 11:47 AM   #10
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Those are indeed my rims and a nice smooth 32 might give more feel, think I might need wider bars as well, the bike actually feels like someone just threw a load of bits together, not a bad spec for the cash, but not quite right. So now I'll give the 26 inch mtb rims a go and if that's not feeling right or clearance is bad give smaller smoother profile tyres a go the Continentals are huge
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Old 10-01-13, 01:13 PM   #11
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can you return it?
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Old 10-03-13, 02:07 AM   #12
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everyone is different, but I find wide bars unweildy on the street.

i'm a pretty big guy, with broad shoulders, and for street riding I like a relatively narrow flat almost straight bar, I cut about an inch of each side of my bar, to bring it under 700mm wide. its just abotu as wide as my shouldlers are, and the same height as my seat, and a bit forward because I have a long torso and wanted to stretch out a bit. its now perfect for me. big wide bars are good on mountain bikes, where they help you maintain control while careening off the landscape, but in urban situations they hit things (car mirrors, pedestrians, turnstiles).

also I have ergon grips with the extenders, so I can ride in a relaxed position with my thumbs pointing forward, and I found this less comfortable when it was wider than my shoulders.
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Old 10-05-13, 08:55 AM   #13
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The bike feels better, but not perfect, with the 26 rims on but it looks weird the forks now have a huge clearance on. If I fitted wider bars it would make a decent enough trail bike. Now looking for some skinnier tyres for rims to see how that feels.
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Old 10-07-13, 12:29 PM   #14
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So now looking for any recommendations on tyres anyone might have, looking for a 622-32 or 35
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Old 10-07-13, 01:24 PM   #15
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I really like my Vittoria Randonneur Hypers. I believe that model has been replaced by the Randonneur Pro. these are very supple, yet strong folding bead high thread count tires with reflective sidewalls. they ride way sweeter than the Nimbus that came on my hybrid.

IMHO, the thread count (TPI) is the most important single factor in a tire.


btw, I notice your original post said '28x1.75'. 28" is an older euro/english designation for what is now called 700c/29er, typically used on bikes with relatively heavy tires, like 1.75" is about 45mm. The *real* size is the 47-622, which is a 700x47... a 32 is going to be a LOT lighter on that rim, and it may or may not handle well, depending on the bike frame geometry. I had an older mountain bike that became very squirrely and twitchy when I put 26x1.5 slick tires on. 26x1.75 slicks were OK (originals were 26x2.125 knobbies)
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Old 10-07-13, 02:07 PM   #16
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I can verify that rim can run a 25mm safely.
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Old 10-07-13, 05:00 PM   #17
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So now looking for any recommendations on tyres anyone might have, looking for a 622-32 or 35
Schwalbe Marathon Supremes if you want to spend the money,otherwise Vittoria Randonneurs.
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