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New tires

Old 03-11-16, 02:04 PM
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LiveTrash
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New tires

Hello! New guy here.

It has come time to get new tires for my Specialized Crosstrail as the stock ones have started to flatten out in the middle and it is very noticeable when trying to do any hard stops. I was running a lightly treaded 700x38c tire. The guy at the bike store suggested a tire with less "nubby" tread I suppose you could call it. Much more rounded and smooth considering I pretty much am always on pavement. He brought down some thinner tires that he said won't really make too much of a difference. He brought down a 30 but didn't have another 30 in stock so he also gave me a 28. He said the 2mm is barely, if at all, noticeable and suggested I can put the 30 on the front for better handling. I didn't really think much of it and was planning on putting the 30 on the rear since that's where most of the weight goes. So anyway, here I am now with a 700x30c and a 700x28c tire (not installed yet) and figured I'd post here and see if anyone has mixed tire widths before and if it really will make a difference (even a slight one) and if I should instead wait for another 30 or 28 to be in stock. Or if I do stick with the different sizes, should one or the other be on the front/back?

Thanks!
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Old 03-11-16, 02:11 PM
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I agree with everything the service technician said. As a matter-of-fact, I think you lucked out with him not having any 38mm tires. I have put a thinner tire on the front before, but I have gotten out of the habit. I think that 28mm on the front will feel much more responsive to you and the 30mm in the back will make you a little quicker. What range-of-tire widths are your rims rated for?
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Old 03-11-16, 02:19 PM
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I'm not too sure how to tell. There's some numbers for the size and what looks like a model name on the rim.

SDX-200 / 622x16c
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Old 03-11-16, 03:26 PM
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Originally Posted by LiveTrash View Post
I'm not too sure how to tell. There's some numbers for the size and what looks like a model name on the rim.

SDX-200 / 622x16c
622 mm is the bead diameter for 700c wheels. 16 is probably your rims' internal width. According to the ETRTO chart used by Sheldon Brown and others -- linked HERE -- you should be good for tires ranging roughly between 25 mm and 38 mm in width. It's a conservative chart, so there's some wiggle room if you want to exceed those minimum and maximum widths.

There wouldn't be any problem running a 28 and a 30. Either width is fine on pavement, and the guy at the shop is right when he says you probably wouldn't notice the mismatch at all. I'm picky enough that the mismatch would probably bother me, but I'm just kinda OCD that way. I'd tell him to order a matching set (in either size) and I'd keep running what I've got 'til it comes in.

But going back to your original post for just a second...

Originally Posted by LiveTrash View Post
It has come time to get new tires for my Specialized Crosstrail as the stock ones have started to flatten out in the middle and it is very noticeable when trying to do any hard stops.
It's normal for tires to square off with mileage, but I'm not following you when you say it's "very noticeable when trying to do any hard stops".
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Old 03-11-16, 04:39 PM
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Originally Posted by SkyDog75 View Post
It's normal for tires to square off with mileage, but I'm not following you when you say it's "very noticeable when trying to do any hard stops".
The wheels lock up and I slide easier because all the tread is worn down in the center and it's basically riding on a flat surface. I don't seem to have very good traction on them. I can snap a picture of them and post it here for reference. I just generally didn't feel very safe riding on them anymore. I've been running those tires for about 2 and a half summers. Roughly from April to October and biking pretty much every day if the weather is nice for about an hour and 20 minutes each time. So in total that's quite a lot of kilometers I would imagine. I bought a little gadget today to measure speed and clock up my kilometers on the odometer for the season. I'll do a bit of math and I'll be able to get a calculation of how many kilometers I put on my old tires.

EDIT: Here's a photo of one of the tires
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Old 03-11-16, 06:40 PM
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Originally Posted by LiveTrash View Post
The wheels lock up and I slide easier because all the tread is worn down in the center and it's basically riding on a flat surface.
Decent new tires could help you get better traction, but your current traction problems aren't due to lack of tread. Not on pavement, at least. Heck, lots of road tires are slicks without any tread at all and they grip fine. Lots of us ride on squared-off high mileage tires and we're not slipping all over the place.

Don't get me wrong, though - I'm not trying to talk you out of new tires! Maybe your current tires just aren't very good.
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Old 03-11-16, 06:50 PM
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Originally Posted by LiveTrash View Post
The wheels lock up and I slide easier because all the tread is worn down in the center and it's basically riding on a flat surface. ]
Not really. You get better traction on pavement with smooth tires. Are you locking up your rear wheel ? If so, use your front brake more. Front brakes are the primary brake for hard braking and stopping. I only use the rear for general slowing.
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Old 03-11-16, 10:18 PM
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I don't like buying anything when a retailer reaches for one product, finds it out of stock then wants to sell me another because "there's really no difference".
I also don't like mixing tire sizes.
But you did buy them and others wiser than me think it's ok, so .......................................
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Old 03-12-16, 08:02 AM
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I would stay with the 38mm tires, but invest in a better quality tire. And my suggestion would be the standard casing Barlow Pass tire from Compass:
https://www.compasscycle.com/shop/co...8-barlow-pass/

Jan Heine owns Compass, publishes Bicycle Quarterly magazine, and for free shares a wealth of information at his blog site https://janheine.wordpress.com

Tires have been a research passion of his for years. Search tire topics at the blog site and you will see. And you can contact Compass directly for advice on the best tire for your needs. You won't be let down.

Steve.
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Old 03-12-16, 08:07 AM
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Enjoy the 28 and the 30..You should like the change.

I had a neighbor try some 28's and he loved them.
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