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mtn bike to tourer...(15 posts)

mtn bike to tourer...Spiderman
Jun 27, 2001 9:38 AM
is it alright, assuming they can fit, to put 700c wheels on my mtn. frame soon-to-be tourer? Will it make the handling crap? I am pretty sure they will fit. any thoughts?
Should be, but why?muncher
Jun 27, 2001 10:01 AM
If you can get the brakes to work, and the gears shift, then fine - but why do you want to do that - MTB wheels are fine for touring (unless yours are shot?)?
Should be, but why?Spiderman
Jun 27, 2001 10:10 AM
they are shot but my bike is going to be slow as it is, i don't want to slow it down more with my smaller wheels.
bad ideaSpoke Wrench
Jun 27, 2001 11:25 AM
First of all, your brakes won't line up.

Secondly, I'm constantly talking to people who are sure 26" wheels are slower. Expect for when you are spun out in your highest gear, larger wheels won't make you go any faster. That doesn't happen very often for most people.

If it was me, I'd put my money into narrower, smooth tires and maybe a road crankset and front derailleur.
bad ideaSpiderman
Jun 27, 2001 11:29 AM
my plan right now is to have a mountain frame, road handlebars and roud gruppo. Probably 105 or ultegra triple. It is easier than doing road double with a mountain cassette, which i had considered too. Well thanks for the input, I'll use mtn wheels with some slicks. thanks.
re: mtn bike to tourer...Rich Clark
Jun 27, 2001 12:08 PM
The brakes won't align with the rims. Even if they did, you'd probably have to use smaller tires than you'd like in order to clear the seatstay bridge. Good 700c touring rims are expensive, compared to MTB rims of the same strength.

Why bother? You can get real nice slicks or touring tires for 26" rims. Try Bontrager Revolt SS or Avocet Cross K's.

Many highly-respected touring bikes are set up for 26" wheels and MTB groups right out of the box. Bruce Gordon's website. Personally, if I had a perfectly good MTB and wanted a touring bike, and was willing to scrounge for parts, I'd scrounge for a touring frame too. (I saw a Novara Randonee frame at REI, brand new, for $100 not long ago). Then I'd have two bikes, which is always a good thing.

I want to do the same with my Rockhopper>>>>>>>>>>Live Steam
Jun 27, 2001 12:13 PM
I am buying my girlfriend a Trek 7500FXT to ride because she doesn't like drop bars. Since we plan on doing the Sunday charity ride thing together on weekends, I thought I would fit my MTB the same way the Trek is built. I feel it will better suit me for the 12 - 15 mph riding she wants to do rather than me tooling away on my Colnago. However, the dropout spacing on a mountain bike is 135mm. The spacing on road wheels is 130mm. So, you'll have to make the wheels up yourself or somehow make up the difference. Also, they are correct about the brakes. They will not align with the rim. My thoughts on that are to 1. replace my suspension fork with a carbon road fork. This will at least give me a front hanger for a standard pivoting caliper brake. Or 2. change both front and rear to disks. They are pretty cheap now, though I don't know how they are fitted to the bike yet. A road fork may not accommodate a disk so I'm back to the same problem. My only other problem is - will a Shimano 8/9 speed hub work with a 7 speed Deore XT drive train? I need to do a little more research, but if anyone has any thoughts on the subject, please chime in.
canti brakesSpiderman
Jun 27, 2001 12:40 PM
what i meant to say is have 105 or ultegra triple with canti avid shorty brakes. I have been doing a lot of research and basically following the components of a trek 520 or a Bruce Gordon BLT.
At least for road bikes, 8 and nine speed cassettes can fit on the same size hub, 7 does not. It may be different on mtn bikes though.
I would do STI shifting, 105/ultegra drivetrain, mtn fork, some crappy headset, avid shorty 6's, drop bars and some other ragtag crap. After this its gonna become my commuter bike. It won't be really fast but it'll get the job done.
8/9 speed hubs with 7sp cassetteKevin M
Jun 27, 2001 1:26 PM
I have a touring bike (700C wheels). I built a new set of wheels recently using Ultegra hubs (8/9 rear to allow for upgradability in the future). For now I kept the existing 7 speed drive train. I put the cassete with a 4 mm spacer (from LBS) between the cassette and the hub flange. I got the Deore XT (long cage) rear deraileur which can be used for 7, 8, or 9 speed. Now my touring bike has 24/36/46 chainrings and 13-30 cassette. A pretty good range for climbing mountains even with gear on the bike.
8/9 speed hubs with 7sp cassetteLive Steam
Jun 27, 2001 1:47 PM
So, if I understand you correctly - the 4mm spacer makes up the difference in the dropout spacing and keeps the indexing correct for shifting? The 4mm spacer is the same spacer used on standard Shimano cassettes? Hope this makes sense!
I want to do the same with my Rockhopper>>>>>>>>>>Jofa
Jun 27, 2001 3:47 PM
Unless I'm missing something, I haven't the faintest idea why anybody would want to change from one wheel size to another on one bike; it seems like overcomplexity gone absurd! If you want higher gears on a mountain bike, then get some bigger chainrings, or plonk a road triple chainset on there; though for touring, I've always found a standard MTB range to be more than enough.
The only reason I could imagine you'd want to change the forks is that you may want to fit a front pannier rack; in this case, a custom builder will make you some steel forks with all the relevant braze-ons for little money.
All the gearing issues you mention could be resolved with various spacers on the rear cassette, but FWIW, I see no reason why you need do anything more than put some slick tyres on. This stuff is all simpler than many would have you believe.
How about speed due to rolling resistance?>>>>>>>>>>Live Steam
Jun 27, 2001 3:54 PM
I would think that a good deal more speed can be obtained due to thinner tires, higher psi = less rolling resistance. Also there is a weight savings associated with this changeout. I also need a project. I love tinkering and right now I do not need the expense of building up another bike from scratch. I just thought it would be fun.:-) Oh well.
I don't mean to dent your enthusiasm...Jofa
Jun 27, 2001 5:26 PM all means, tinker away. I just don't think it's ever necessary do change everything in order to do a slightly different kind of riding.... a bicycle- any bicycle- is by design muti-use.
!00psi 1inch tyres are readily available for MTB's: Conti GP's come to mind. The weight of MTB and road wheels is virtually indistinguishable... the requirements are little different, given that rough terrain is dealt with by balloon tyres; but if you want lighter wheels than you already have, there are lightweight 26" rims available.
If you want a good tinkering project- build some wheels: buy some Shimano135mm (MTB) hubs of whatever quality you can afford, some nice light box-section 26" rims, spokes to fit and -most importantly- a copy of "The Bicycle Wheel', by Jobst Brandt, and of course a nice bottle of wine. Reserve an evening; follow the instructions in the book to the letter, and you'll have an immaculate pair of light wheels that will be more reliable than anybody else's unless they built them the same way.
Well this seems to be a better answer, but>>>>>>>>>>>Live Steam
Jun 28, 2001 6:45 AM
what size tubes do I need for the Contis? I like the idea of a 100psi rating and 1in dia tires. That was my objective. I didn't realize that they made these for 26in rims. I know I shouldn't ask, but would a 650cm wheel setup work with the brakes?
Well this seems to be a better answer, but>>>>>>>>>>>tubes?
Jun 29, 2001 10:56 AM