but now it's a whole other level of comfort for me.
I could barely tell the difference between 23s and 25s.
Moderator: robbosmans
but now it's a whole other level of comfort for me.
Mr.Gib wrote:Well, it's all said and done now. I've been riding the Altum for several month. It is just an excellent bike. As comfortable as any race bike, very light and stiff, good clearance for 28 mm tires also (depending on tire and rim combo). I was a bit concerned about the geometry in terms of the tall front end, but I you choose the right size, use the smallest headset spacer, and get your reach with a long stem, it can be set up reasonably aggressively. I am quite thrilled with the whole package.
3 criticisms:
1. Too much toe overlap which is only an issue in the parking lot so not a legitimate complaint. But I never unclip when I stop, just track stand so I have to be careful. Having big feet doesn't help.
2. Depending on the size, the front end turn-in is not as quick as I prefer. The head tube angle is a bit more upright in the larger sizes which will calm down the handling. Most riders would probably prefer this but I prefer super quick steering. Of course as a result, despite its short wheelbase and low weight, the bike is incredibly stable in all situations.
3. The seatpost clamp uses a 4 mm hex bolt and asks for 8 nm of torque. That is too much torque for such a small bolt. It works but you have to be careful.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
Mr.Gib wrote:Hey Boots,
Regarding tire clearance, 28 mm GP 4000 will fit depending on the rim. I tried with Pacenti SL 23 V2 and they barely cleared but IMO could not be ridden safely. 25 mm GP 4000 on that rim leaves loads of space, and a smaller 28 from another manufacturer would probably work. Fact is, the 28 mm GP 4000 is a freakin' massive tire and on a wide rim is is a baloon - measure aprox 32 mm on the Pacenti. It might work on a narrower rim though. FWIW I preferred the handling with 25 mm. The bike is pretty comfy and unless you are on really bad roads or gravel, 25 mm seems optimal. The Altum is light and tight and you lose some of that with a squishy 28 mm at sub 90 psi. I am currently running Michelin Power Comp 25 mm on rims that have a 17 mm internal width.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
boots2000 wrote:What model 28mm tires are you running?
Does the Altum have enough clearance for Conti GP 4000 II in 28mm?
I was just checking clearance on a Trek Emonda- the GP4000 II 28mm barely clears the top inside of the fork- So I am looking at other options.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.
boots2000 wrote:I guess that we like different things in terms of tires.
I love that 700x28mm Conti GP4000 II- I run it at 60 in front and 65 in back.
Not squishy at all for me. I descend fast and the tire does not feel slow uphill.
When you say that it barely clears, where and how does it barely clear? Is it height that is an issue or width?
Wouldn't a wider rim make the tire less tall but wider?Mr.Gib wrote:Hey Boots,
Regarding tire clearance, 28 mm GP 4000 will fit depending on the rim. I tried with Pacenti SL 23 V2 and they barely cleared but IMO could not be ridden safely. 25 mm GP 4000 on that rim leaves loads of space, and a smaller 28 from another manufacturer would probably work. Fact is, the 28 mm GP 4000 is a freakin' massive tire and on a wide rim is is a baloon - measure aprox 32 mm on the Pacenti. It might work on a narrower rim though. FWIW I preferred the handling with 25 mm. The bike is pretty comfy and unless you are on really bad roads or gravel, 25 mm seems optimal. The Altum is light and tight and you lose some of that with a squishy 28 mm at sub 90 psi. I am currently running Michelin Power Comp 25 mm on rims that have a 17 mm internal width.
kode54 wrote:boots2000 wrote:I guess that we like different things in terms of tires.
I love that 700x28mm Conti GP4000 II- I run it at 60 in front and 65 in back.
Not squishy at all for me. I descend fast and the tire does not feel slow uphill.
When you say that it barely clears, where and how does it barely clear? Is it height that is an issue or width?
Wouldn't a wider rim make the tire less tall but wider?Mr.Gib wrote:Hey Boots,
Regarding tire clearance, 28 mm GP 4000 will fit depending on the rim. I tried with Pacenti SL 23 V2 and they barely cleared but IMO could not be ridden safely. 25 mm GP 4000 on that rim leaves loads of space, and a smaller 28 from another manufacturer would probably work. Fact is, the 28 mm GP 4000 is a freakin' massive tire and on a wide rim is is a baloon - measure aprox 32 mm on the Pacenti. It might work on a narrower rim though. FWIW I preferred the handling with 25 mm. The bike is pretty comfy and unless you are on really bad roads or gravel, 25 mm seems optimal. The Altum is light and tight and you lose some of that with a squishy 28 mm at sub 90 psi. I am currently running Michelin Power Comp 25 mm on rims that have a 17 mm internal width.
that's really low tire pressure...for a tube tire. where i live, that will pinch flat coming out of my driveway.
kode54 wrote:tubeless would work at that low pressure...but a tubed tire? hit a pothole and you'll get a snake bite, yes?
ShutUpLegsNow wrote:Can any of you ESX / Altum owners help with this post please - Kode54? JimV?
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