Running a 70mm riser stem on a Tri bike: Triathlon Forum: Slowtwitch Forums

Running a 70mm riser stem on a Tri bike

Dec 30, 17 16:33

Post #1 of 7 (1351 views)

Hello,

First of all just wanted to say that this is one of the best forums I've been ever been on. Super helpful advice all-around.

In trying to fit my slight oversized Planet X Tri bike (XL size), I am looking at either a 70mm 17 degree or 35 degree stem. Right now I am running a 110mm adjustable stem. I found a comfortable position with the stem at 35 degrees. However the 110mm stem length too long as I can't comfortably get my elbows at a 90 degree angle on the aero bar pad. I figured shortening the stem length by 4 cm will help with this.

Is a 70mm 17/35 degree stem too twitchy with tri bars or will it be ok if it makes for a better fit?

Thanks

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [gazoome] [ In reply to ]

Quote | Reply

FatandSlow

Dec 30, 17 16:45

Post #2 of 7 (1341 views)

I don't think you'll have any problem with the 70. I'm not sure you'll find a -35.

Ritchey does a Comp stem in a +30. It doesn't say you can't flip it. But it doesn't say you can' either. Special Comp comes in -12, -17, and -24. They come with shims that will add/subtract 4 degrees. So the -24 will get you to -28. Finally, Ritchey's adjustable comes in a 90. going to -35 may get you close to 70. I'm just too damn lazy to do the math.

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [FatandSlow] [ In reply to ]

Quote | Reply

gazoome

Dec 30, 17 17:25

Post #3 of 7 (1320 views)

I actually found a stem online that's 70mm long and 35 degrees. It's like 15 dollars. Let me know and I'll send you a link.

Still trying to figure out if 35/17 degrees is best based on spacers and position.

Anyway so 70mm stem length is not an issue on tri bars?

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [gazoome] [ In reply to ]

Quote | Reply

jimatbeyond

Dec 30, 17 17:54

Post #4 of 7 (1295 views)

No.

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [gazoome] [ In reply to ]

Quote | Reply

MattyK

Dec 30, 17 22:19

Post #5 of 7 (1228 views)

(Not a pro fitter, just opinionated)

Don’t see that you’ll have a problem with a 70mm stem. But remember it won’t be as high as a 110mm stem...

However, two things
1) there is no reason for your elbows to be at 90 degrees. Most people would have them more open

2) a short tall stem on an XL bike sounds like an unusual fit. Got any pictures of you on the bike? Warning, your fit will probably get torn to shreds :)

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [MattyK] [ In reply to ]

Quote | Reply

jkhayc

Dec 31, 17 6:53

Post #6 of 7 (1167 views)

MattyK wrote:

2) a short tall stem on an XL bike sounds like an unusual fit. Got any pictures of you on the bike? Warning, your fit will probably get torn to shreds :)

I concur, post pics for general consensus before opting for a 70 super rise on your tri bike.

Last edited by: jkhayc: Dec 31, 17 6:53

Quote Reply

Re: Running a 70mm riser stem on a Tri bike [MattyK] [ In reply to ]

Quote | Reply

Andrew Coggan

Dec 31, 17 9:10

Post #7 of 7 (1133 views)

MattyK wrote:

there is no reason for your elbows to be at 90 degrees. Most people would have them more open

+1.

Quote Reply